Segment Reporting [Abstract] Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Segment Reporting, Revenue Reconciling Item [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] Total Segment Revenue from Contracts with External Customers Revenue from Contract with Customer, Excluding Assessed Tax Gain (Loss) on Commodity Derivative Instruments Gain (Loss) on Hedging Activity Other Operating Income Other Operating Income Total Consolidated Revenue and Other Operating Income Revenues Property, Plant and Equipment [Abstract] Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Amortization Expense Per Unit of Production Schedule of Amortization Expense Per Unit of Production [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships Customer Relationships [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Other Intangible Assets Finite-Lived Intangible Assets, Net [Abstract] Gross Amortizable Asset - Customer Relationships Finite-Lived Customer Relationships, Gross Less: Accumulated Amortization - Customer Relationships Finite-Lived Intangible Assets, Accumulated Amortization Total Other Intangible Assets, net Finite-Lived Intangible Assets, Net Organization, Consolidation and Presentation of Financial Statements [Abstract] Numerator: Earnings Per Share Reconciliation [Abstract] Income from Continuing Operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Net Income Attributable to Noncontrolling Interests Net Income (Loss) Attributable to Noncontrolling Interest Net (Loss) Income from Continuing Operations Attributable to CNX Resources Shareholders Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Income from Discontinued Operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net (Loss) Income Attributable to CNX Resources Shareholders Net Income (Loss) Attributable to Parent Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Weighted-average shares of common stock outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Effect of diluted shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted-average diluted shares of common stock outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted (Loss) Earnings Per Share Earnings Per Share [Abstract] Basic (Continuing Operations) (in usd per share) Income (Loss) from Continuing Operations, Per Basic Share Basic (Discontinued Operations) (in usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Total Basic Earnings (Loss) Per Share (in usd per share) Earnings Per Share, Basic Diluted (Continuing Operations) (in usd per share) Income (Loss) from Continuing Operations, Per Diluted Share Diluted (Discontinued Operations) (in usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Total Diluted Earnings (Loss) Per Share (in usd per share) Earnings Per Share, Diluted Leases [Abstract] Operating leases, weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Finance leases, weighted average remaining lease term Finance Lease, Weighted Average Remaining Lease Term Operating leases, weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Finance leases, weighted average discount rate Finance Lease, Weighted Average Discount Rate, Percent Share-based Payment Arrangement, Noncash Expense [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Employee Stock Option Share-based Payment Arrangement, Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period End balance (in shares) Exercisable at December 31, 2019 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Beginning balance (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Expired (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Ending balance (in usd per share) Exercisable at December 31, 2019 (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted average remaining contractual term, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual term (in years), exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate intrinsic value, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Discontinued Operations and Disposal Groups [Abstract] Schedule of Financial Information for Divested Business Within Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Extractive Industries [Abstract] Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] Reserve Quantities by Type of Reserve [Axis] Petroleum Reserves [Axis] Type of Reserve [Domain] Type of Reserve [Domain] Natural Gas Natural Gas [Member] Oil Oil [Member] NGLs Natural Gas Liquids [Member] Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] Revenues Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Cash Inflows Production Costs Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Production Costs Development Costs Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Development Costs Income Tax Expense Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Income Tax Expense Future Net Cash Flows Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows Discounted to Present Value at a 10% Annual Rate Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Ten Percent Annual Discount for Estimated Timing of Cash Flows Total Standardized Measure of Discounted Net Cash Flows Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves Adjusted oil price (in usd per barrel) Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Adjusted Price Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Adjusted Price Schedule of Assets Amortized by Units of Production [Table] [Table] Schedule of Assets Amortized by Units of Production [Table] [Table] Schedule of Assets Amortized by Units of Production [Table] [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Assets amortized by units of production Assets Amortized By Units Of Production [Member] Assets amortized by units of production [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Unproved Gas Properties Unproved Oil and Gas Property, Successful Effort Method Advance Royalties Advances for Gas Exploration, Development and Production Amount Total Property, Plant and Equipment, Gross Reconciliation of Assets from Segment to Consolidated [Table] Reconciliation of Assets from Segment to Consolidated [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Exploration and Production Equipment Exploration and Production Equipment [Member] Midstream CNXM [Member] CNXM [Member] Intercompany Eliminations Intersegment Eliminations [Member] Segment Reconciling Items Segment Reconciling Items [Member] Segment Reporting, Asset Reconciling Item [Line Items] Segment Reporting, Asset Reconciling Item [Line Items] Items Excluded from Segment Assets: Segment Reporting Information Other Items Not Allocated To Segments [Abstract] Segment Reporting Information, Other Items Not Allocated to Segments [Abstract] Segment Assets Assets Cash and Cash Equivalents Investments and Cash Recoverable Income Taxes Income Taxes Receivable, Current Intangible Drilling Cost Drilling Cost Drilling Cost Gas Gathering Equipment Gas Gathering Systems Net Gas Gathering Systems, Net Proved Gas Properties Proved Oil and Gas Property, Successful Effort Method Gas Wells and Related Equipment Gas wells and related equipment Gas Wells and Related Equipment Surface Land and Other Equipment Surface Land And Other Equipment Surface Land And Other Equipment Other Other gas assets Other Gas Assets Less: Accumulated Depreciation, Depletion and Amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total Property, Plant and Equipment—Net Property, Plant and Equipment, Net Natural Gas, NGLs and Oil Revenue Results of Operations, Sales Revenue to Unaffiliated Enterprises Gas Royalty Interests and Purchased Gas Sales Gas Royalty Interests and Purchased Gas Sales Gas Royalty Interests and Purchased Gas Sales Total Revenue Results of Operations, Revenue from Oil and Gas Producing Activities Lease Operating Expense Results of Operations, Production or Lifting Costs Production, Ad Valorem, and Other Fees Production Tax Expense Transportation, Gathering and Compression Results of Operations, Transportation Costs Purchased Gas Costs Results Of Operations, Purchased Gas Costs Results Of Operations, Purchased Gas Costs Impairment of Exploration and Production Properties Impairment of Oil and Gas Properties Impairment of Unproved Properties and Expirations Impairment Of Oil And Gas Properties, Unproved Properties Impairment Of Oil And Gas Properties, Unproved Properties Exploration Costs Results of Operations, Expense, Other DD&A Results of Operations, Depreciation, Depletion, Amortization and Accretion Total Costs Results of Operations, Expense from Oil and Gas Producing Activities Pre-tax Operating Income / (Loss) Results of Operations, Income before Income Taxes Income Tax Benefit Results of Operations, Income Tax Expense Results of Operations for Producing Activities excluding Corporate and Interest Costs Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs) Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Stock-Based Compensation Share-based Payment Arrangement [Text Block] Long-term Debt, Other Disclosures [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] CNX Revolving Credit Facility CNX Revolving Credit Facility [Member] CNX Revolving Credit Facility [Member] CNX Midstream Partners LP Revolving Credit Facility CNX Midstream Partners LP Revolving Credit Facility [Member] CNX Midstream Partners LP Revolving Credit Facility [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 5.875% Senior Notes due 2022 5.875% Senior Notes due 2022 [Member] 5.875% Senior Notes due 2022 [Member] Revolving Credit Facility Revolving Credit Facility [Member] Senior Notes due March 2027 at 7.25% Senior Notes Due March 2027 [Member] Senior Notes Due March 2027 [Member] Senior Notes due March 2026 6.50% Senior Notes due March 2026 [Member] 6.50% Senior Notes due March 2026 [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt instrument, face amount Debt Instrument, Face Amount Debt Instrument, unamortized premium Debt Instrument, Unamortized Premium, Current Debt instrument, unamortized discount Debt Instrument, Unamortized Discount, Current Stated rate, debt instrument Debt Instrument, Interest Rate, Stated Percentage Less: Unamortized Debt Issuance Costs Debt Issuance Costs, Net Long-Term Debt Long-term Debt Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Total CNX Resources Corporation Stockholders' Equity Parent [Member] Common Stock and Capital in Excess of Par Value Common Stock Including Additional Paid in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Non-Controlling Interest Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, Beginning of Period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Issuance of Common Stock Stock Issued During Period, Value, New Issues Purchase and Retirement of Common Stock Stock Repurchased and Retired During Period, Value Amortization of Stock-Based Compensation Awards APIC, Share-based Payment Arrangement, Increase for Cost Recognition Distribution of CONSOL Energy, Inc. Stockholders' Equity Note, Spinoff Transaction Net Income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Shares Withheld for Taxes Shares Granted, Value, Share-based Payment Arrangement, Forfeited ASU 2018-02 Reclassification Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect Other Comprehensive (Loss) Income Other Comprehensive Income (Loss), Net of Tax Distributions to CNXM Noncontrolling Interest Holders Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Acquisition of CNX Gathering, LLC Noncontrolling Interest, Increase from Business Combination Balance, End of Period Equity [Abstract] Share repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Stock repurchased during period (in shares) Stock Repurchased During Period, Shares Treasure stock acquired (in usd per share) Treasury Stock Acquired, Average Cost Per Share Stock repurchased and retired Weighted average fair value of grants (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected forfeiture rate Share Based Comp expected forfeiture rate Share Based Comp expected forfeiture rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected term in years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Property Acquisitions: Costs Incurred, Acquisition of Oil and Gas Properties [Abstract] Proved Properties Costs Incurred, Acquisition of Oil and Gas Properties with Proved Reserves Unproved Properties Costs Incurred, Acquisition of Unproved Oil and Gas Properties Development Costs Incurred, Development Costs Exploration Costs Incurred, Exploration Costs Total Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] Stock Option Activity Rollforward [Abstract] Stock Option Activity Rollforward [Abstract] Stock Option Activity Rollforward [Abstract] Balance, Beginning of Year (in shares) Common Stock, Shares, Outstanding Issuance Related to Stock-Based Compensation (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Retirement of Common Stock (in shares) Stock Repurchased and Retired During Period, Shares Balance, End of Year (in shares) Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Changes in Accumulated Other Comprehensive Loss [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Other Comprehensive Loss before Reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts Reclassified from Accumulated Other Comprehensive Loss, net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Risks and Uncertainties [Abstract] Schedules of Concentration of Risk, by Risk Factor Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Defined Contribution Plan [Abstract] Pension Pension and Other Postretirement Benefits Disclosure [Text Block] Service Cost Defined Benefit Plan, Service Cost Interest Cost Defined Benefit Plan, Interest Cost Amortization of Prior Service Credits Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Recognized Net Actuarial Loss Defined Benefit Plan, Amortization of Gain (Loss) Curtailment Gain Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment Net Periodic Benefit Cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Schedule of Accumulated Other Comprehensive Income/(Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Reclassification of Adjustments to Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Fair Value Disclosures [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Gas Derivatives Derivative Asset Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] CNX Gathering CNX Gathering LLC [Member] CNX Gathering LLC [Member] CNXM Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Operating Income Other Operating Income (Expense) [Member] Transportation, Gathering and Compression Transportation, Gathering and Compression [Member] Transportation, Gathering and Compression [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Equity in Earnings Income (Loss) from Equity Method Investments Business Combinations [Abstract] Acquisitions And Dispositions Acquisitions And Dispositions Disclosure [Text Block] This element may be used to capture disclosure pertaining to acquisitions and dispositions. For acquisitions, description of a business acquisition (or series of individually immaterial business combinations) planned, initiated, or completed during the period, including background, timing, and allocation of acquisition costs. For dispositions, disclosure includes the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain or loss recognized in the income statement and the income statement caption that includes that gain or loss, and the segment in which the disposal group was reported. Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Lease renewal term Lessee, Operating Lease, Renewal Term Operating leases rent expense Operating Leases, Rent Expense, Net Income Tax Disclosure [Abstract] Valuation Allowance [Table] Valuation Allowance [Table] Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Deferred Tax Asset [Domain] Deferred Tax Asset [Domain] Alternative Minimum Tax Credit Alternative Minimum tax credit [Member] Alternative Minimum tax credit [Member] Charitable Contributions Charitable Contributions [Member] Charitable Contributions [Member] State operating losses Deferred Tax Asset, Valuation Allowance, State Operating Losses [Member] Deferred Tax Asset, Valuation Allowance, State Operating Losses [Member] Valuation Allowance [Line Items] Valuation Allowance [Line Items] Net Operating Loss - State Deferred Tax Assets, Operating Loss Carryforwards, Domestic Deferred tas asset, federal alternative minimum tax credit Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Decrease in federal alternative minimum tax Decrease in Federal Alternative minimum Tax Decrease in Federal Alternative minimum Tax Increase (decrease) in valuation allowance, federal alternative minimum tax credit Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Valuation allowance on foreign tax credits valuation allowance on foreign tax credits valuation allowance on foreign tax credits Valuation Allowance Deferred Tax Assets, Valuation Allowance Deferred tax asset related to state operating losses Deferred Tax Assets, Operating Loss Carryforwards, State and Local Reduction in income tax expense due to non-controlling interest Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount Tax Cuts And Jobs Act Of 2017, revaluation of deferred tax assets and liabilities, benefit Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) Tax Cuts and Jobs Act of 2017, AMT credit carryforward Tax Cuts and Jobs Act of 2017, AMT Tax Credit, Income Tax Expense (Benefit) Tax Cuts and Jobs Act of 2017, AMT Tax Credit, Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, federal net operating loss carryback Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Federal Net Operating Loss Carryback, Provisional Income Tax Expense (Benefit) Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Federal Net Operating Loss Carryback, Provisional Income Tax Expense (Benefit) Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Increase in Unrecognized Tax Benefits Resulting from Tax Positions Taken During Prior Periods Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Reduction to unrecognized tax benefits, from position taken on state tax return Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Accrued liability relating to uncertain tax positions Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Interest income included in accrued interest liability Unrecognized Tax Benefits, Interest on Income Taxes Accrued Accrued liabilities for tax penalties Unrecognized Tax Benefits, Income Tax Penalties Accrued Reduction to net operation loss, resulting from income tax examination Income Tax Examination, Reduction to Net Operating Loss Income Tax Examination, Reduction to Net Operating Loss Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Reconciliation of Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Operating Leases Operating Leases, Future Minimum Payments Receivable [Abstract] 2020 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total Lease Payments Lessee, Operating Lease, Liability, Payments, Due Less: Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Present Value of Lease Liabilities Operating Lease, Liability Finance Leases Finance Lease, Liability, Payment, Due [Abstract] 2020 Finance Lease, Liability, Payments, Due Next Twelve Months 2021 Finance Lease, Liability, Payments, Due Year Two 2022 Finance Lease, Liability, Payments, Due Year Three 2023 Finance Lease, Liability, Payments, Due Year Four 2024 Finance Lease, Liability, Payments, Due Year Five Thereafter Finance Lease, Liability, Payments, Due after Year Five Total Lease Payments Finance Lease, Liability, Payment, Due Less: Interest Finance Lease, Liability, Undiscounted Excess Amount Present Value of Lease Liabilities Finance Lease, Liability Stock Repurchase Treasury Stock [Text Block] Income Taxes Income Tax Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap Interest Rate Swap [Member] Derivative [Line Items] Derivative [Line Items] Derivative term of contract Derivative, Term of Contract Schedule of Capital Leased Asssets [Table] Schedule of Capital Leased Assets [Table] Jewell Ridge Pipeline jewell ridge pipeline [Member] jewell ridge pipeline [Member] Vehicles Vehicles [Member] Capital Leased Assets [Line Items] Capital Leased Assets [Line Items] Interest costs capitalized Interest Costs Capitalized Finance lease right-of-use assets, gross Finance Lease, Right-Of-Use Asset, Before Accumulated Amortization Finance Lease, Right-Of-Use Asset, Before Accumulated Amortization Capital leased assets, gross Capital Leased Assets, Gross Accumulated amortization for finance lease right of use asset Finance Lease, Right Of Use Asset, Accumulated Amortization Finance Lease, Right Of Use Asset, Accumulated Amortization Accumulated amortization for capital leases Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation Quarterly Financial Information Disclosure [Abstract] Supplemental Quarterly Info (Unaudited) Quarterly Financial Information [Text Block] Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Revenue from Contract with Customer [Abstract] Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Remaining performance obligations, expected timing of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Other Liabilities Disclosure [Abstract] Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash and Cash Equivalents Cash and Cash Equivalents, at Carrying Value Accounts and Notes Receivable: Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract] Trade (Note 19) Accounts Receivable, after Allowance for Credit Loss, Current Other Receivables Other Receivables, Net, Current Supplies Inventories Inventory, Net Derivative Instruments (Note 21) Derivative Asset, Current Prepaid Expenses Prepaid Expense, Current Total Current Assets Assets, Current Property, Plant and Equipment (Note 10): Property, Plant and Equipment Less—Accumulated Depreciation, Depletion and Amortization Other Assets: Other Assets, Noncurrent [Abstract] Operating Lease Right-of-Use Asset Operating Lease, Right-of-Use Asset Investment in Affiliates Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Derivative Instruments (Note 21) Derivative Asset, Noncurrent Goodwill (Note 11) Goodwill Other Intangible Assets (Note 11) Intangible Assets, Net (Excluding Goodwill) Other Other Assets, Noncurrent Total Other Assets Other Assets TOTAL ASSETS LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Current Liabilities: Liabilities, Current [Abstract] Accounts Payable Accounts Payable, Current Derivative Instruments (Note 21) Derivative Liability, Current Current Portion of Finance Lease Obligations (Note 15) Long-term Debt and Lease Obligation, Current Current Portion of Operating Lease Obligations Operating Lease, Liability, Current Other Accrued Liabilities (Note 13) Other Accrued Liabilities, Current Total Current Liabilities Liabilities, Current Non-Current Liabilities: Long-term Debt, Excluding Current Maturities [Abstract] Long-Term Debt (Note 14) Long-term Debt, Excluding Current Maturities Finance Lease Obligations (Note 15) Finance Lease, Liability, Noncurrent Finance Lease Obligations (Note 15) Capital Lease Obligations, Noncurrent Operating Lease Obligations Operating Lease, Liability, Noncurrent Derivative Instruments (Note 21) Derivative Liability, Noncurrent Deferred Income Taxes (Note 8) Deferred Income Tax Liabilities, Net Asset Retirement Obligations (Note 9) Asset Retirement Obligations, Noncurrent Other Other Liabilities, Noncurrent Total Non-Current Liabilities Total deferred credits and other liabilities Total deferred credits and other liabilities. TOTAL LIABILITIES Liabilities Stockholders’ Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common Stock, $0.01 Par Value; 500,000,000 Shares Authorized, 186,642,962 Issued and Outstanding at December 31, 2019; 198,663,342 Issued and Outstanding at December 31, 2018 Common Stock, Value, Issued Capital in Excess of Par Value Additional Paid in Capital Preferred Stock, 15,000,000 Shares Authorized, None Issued and Outstanding Preferred Stock, Value, Issued Retained Earnings Retained Earnings (Accumulated Deficit) Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total CNX Resources Stockholders’ Equity Stockholders' Equity Attributable to Parent Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest TOTAL STOCKHOLDERS' EQUITY TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Costs reclassified to wells, equipment and facilities based on the determination of proved reserves Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves Costs expensed due to determination of dry hole or abandonment of project Exploration Abandonment and Impairment Expense Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] U.S. Federal Current Federal Tax Expense (Benefit) U.S. State Current State and Local Tax Expense (Benefit) Current income tax (benefit) Current Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] U.S. Federal Deferred Federal Income Tax Expense (Benefit) U.S. State Deferred State and Local Income Tax Expense (Benefit) Deferred income tax (benefit) Deferred Income Tax Expense (Benefit) Income Tax Expense (Benefit) / Effective Rate Income Tax Expense (Benefit) Concentration of Credit Risk and Major Customers Concentration Risk Disclosure [Text Block] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Total Natural Gas, NGLs and Oil Revenue Oil and Gas Service [Member] NGLs Revenue NGLs [Member] NGLs [Member] Condensate Revenue Condensate [Member] Condensate [Member] Oil Revenue Purchased Gas Revenue Oil and Gas, Purchased [Member] Midstream Revenue Natural Gas, Midstream [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenue from contracts with customers Gain (Loss) on Commodity Derivative Instruments Other Operating Income Total Revenue and Other Operating Income Commitments and Contingencies Disclosure [Abstract] Commitments and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Short-term Debt, Other Disclosures [Abstract] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Federal Funds Open Rate Federal Funds Open Rate [Member] Federal Funds Open Rate [Member] One-Month LIBOR One-Month LIBOR [Member] One-Month LIBOR [Member] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Letter of Credit Letter of Credit [Member] Short-term Debt [Line Items] Short-term Debt [Line Items] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Accordion feature, increased commitment Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Initial borrowing base Debt Instrument, Borrowing Base Debt Instrument, Borrowing Base Net leverage ratio Debt Instrument, Net Leverage Ratio Debt Instrument, Net Leverage Ratio Percentage of aggregate commitments available under credit facility Line Of Credit Facility, Availability Under Credit Facility, Percentage Of Aggregate Commitments Line Of Credit Facility, Availability Under Credit Facility, Percentage Of Aggregate Commitments Number of days outstanding, prior to springing maturity date Number Of Days Outstanding, Prior To Springing Maturity Date, Debt Securities Number Of Days Outstanding, Prior To Springing Maturity Date, Debt Securities Minimum threshold to activate springing maturity date Debt Instrument, Minimum Threshold to Activate Springing Maturity Date Debt Instrument, Minimum Threshold to Activate Springing Maturity Date Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Value of proved reserves, percentage to mortgage Percentage to Mortgage, Value of Proved Reserves Percentage to Mortgage, Value of Proved Reserves Value of proved developing producing reserves, percentage to mortgage Percentage to Mortgage, Value of Proved Developed Producing Reserves Percentage to Mortgage, Value of Proved Developed Producing Reserves Maximum net leverage ratio Maximum Interest Ratio per Credit Facility Covenant Maximum Interest Ratio per Credit Facility Covenant Minimum current ratio minimum current ratio per credit facility minimum current ratio per credit facility Borrowings outstanding Long-term Line of Credit Letters of credit outstanding Letters Of Credit Amount Outstanding Letters Of Credit, Amount Outstanding Borrowings and issuance of letters of credit remaining capacity Line of Credit Facility, Remaining Borrowing Capacity Increase in available borrowings Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature Secured leverage ratio Credit Facility, Debt Covenant, Secured Leverage Ratio Credit Facility, Debt Covenant, Secured Leverage Ratio Pro forma availability of commitments, percentage Line Of Credit Facility, Pro Forma Availability Of Commitments, As A Percent Line Of Credit Facility, Pro Forma Availability Of Commitments, As A Percent Basket of repurchase of LP units tied to Available Cash, annual limit Line Of Credit Facility, Basket Of Repurchase, Annual Limit Of Available Cash Line Of Credit Facility, Basket Of Repurchase, Annual Limit Of Available Cash Basket of repurchase of LP units tied to Available Cash, lifetime limit Line Of Credit Facility, Basket Of Repurchase, Lifetime Limit Of Available Cash Line Of Credit Facility, Basket Of Repurchase, Lifetime Limit Of Available Cash Letters of credit, maximum borrowing capacity Letters Of Credit, Maximum Borrowing Capacity Letters Of Credit, Maximum Borrowing Capacity Maximum net leverage ratio Credit Facility, Debt Covenant, Total Leverage Ratio Credit Facility, Debt Covenant, Total Leverage Ratio Interest coverage ratio Debt Instrument, Interest Coverage Ratio Debt Instrument, Interest Coverage Ratio Current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Schedule of Notional Amounts of Outstanding Derivative Positions Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of Derivative Liabilities at Fair Value Schedule of Derivative Liabilities at Fair Value [Table Text Block] Schedule of Derivative Assets at Fair Value Schedule of Derivative Assets at Fair Value [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Revenue Revenues [Abstract] Gathering Revenue - Related Party Revenue from Related Parties Gathering Revenue - Third Party Gathering Revenue Excluding Related Party Gathering Revenue Excluding Related Party Expenses Costs and Expenses [Abstract] Operating Expense - Related Party Related Party Transaction, Expenses from Transactions with Related Party Operating Expense - Third Party Operating Expense Excluding Related Party Operating Expense Excluding Related Party General and Administrative Expense - Related Party Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party General and Administrative Expense - Third Party General and Administrative Expense Excluding Related Party General and Administrative Expense Excluding Related Party Loss on Asset Sales and Abandonments, net Gain (Loss) on Disposition of Assets Depreciation Expense Depreciation Interest Expense Interest Expense Total Costs and Expenses Costs and Expenses Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Long-term Debt Long-term Debt [Text Block] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Revenue From Contracts With Customers Revenue from Contract with Customer [Text Block] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Shirley-Penns System Shirley-Penns System [Member] Shirley-Penns System [Member] CNX Midstream Partners LP CNX Midstream Partners LP [Member] CNX Midstream Partners LP [Member] Partner Type [Axis] Partner Type [Axis] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] General Partner General Partner [Member] Ownership percentage by parent Noncontrolling Interest, Ownership Percentage by Parent Variable interest entity, ownership percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Payable to affiliates Accounts Payable to Affiliates, Accrued but Unpaid Gathering Services Accounts Payable to Affiliates, Accrued but Unpaid Gathering Services Cash consideration transferred Business Combination, Consideration Transferred Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table] Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table] Energy [Axis] Energy [Axis] Energy [Domain] Energy [Domain] Proved Undeveloped Proved Undeveloped [Member] Proved Undeveloped [Member] Condensate & Crude Oil Crude Oil [Member] Revisions Due to Five Year Rule Revisions Due to Five Year Rule [Member] Revisions Due to Five Year Rule [Member] Price Revisions Price Changes [Member] Price Changes [Member] Revisions Due to Plan Changes Plan Changes [Member] Plan Changes [Member] Revisions Due to Changes Due to Well Performance Plan and Other Revisions [Member] Plan and Other Revisions [Member] Reserve Quantities [Line Items] Reserve Quantities [Line Items] Proved Developed and Undeveloped Reserves [Roll Forward] Proved Developed and Undeveloped Reserves [Roll Forward] Beginning balance (volume) Proved Developed and Undeveloped Reserves, Net Revisions (volume) Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates Price Changes (volume) Proved Developed and Undeveloped Reserves, Price Changes Proved Developed and Undeveloped Reserves, Price Changes Extension and Discoveries (volume) Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions Production (volume) Proved Developed and Undeveloped Reserves, Production Purchases of Reserves In-Place (volume) Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place Sales of Reserves In-Place (volume) Proved Developed and Undeveloped Reserves, Sales of Minerals in Place Ending balance (volume) Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] Beginning balance (energy) Proved Developed and Undeveloped Reserve, Net (Energy) Revisions (energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) Price changes (energy) Proved Developed and Undeveloped Reserves, Price Changes (Energy) Proved Developed and Undeveloped Reserves, Price Changes (Energy) Undeveloped reserves transferred to developed undeveloped reserves transferred to developed undeveloped reserves transferred to developed Extensions and Discoveries (energy) Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) Production (MMcfe) Proved Developed and Undeveloped Reserve, Production (Energy) Purchases of Reserves In-Place (energy) Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy) Sales of Reserves In-Place (energy) Proved Developed and Undeveloped Reserves, Sale of Mineral in Place (Energy) Ending balance (energy) Proved developed resources (volume) Proved Developed Reserves (Volume) Proved developed resources (energy) Proved Developed Reserves (Energy) Proved undeveloped resources (volume) Proved Undeveloped Reserve (Volume) Proved undeveloped resources (energy) Proved Undeveloped Reserves (Energy) Downward revision due to PUD removal (energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate Resulting From PUD Removal (Energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate Resulting From PUD Removal (Energy) Upward revision from increased performance through optimization (energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Increased Performance (Energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Increased Performance (Energy) Downward revision due to plan changes (energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Plan Changes (Energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Plan Changes (Energy) Capital spent related to undeveloped reserves transferred to developed Payments to Acquire Property, Plant, and Equipment Reserves reported for more than five years Proved Developed and Undeveloped Reserve, Reserves Reported For More Than Five Years (Energy) Proved Developed and Undeveloped Reserve, Reserves Reported For More Than Five Years (Energy) Number of wells pending determination of proved reserves Number Of Wells Pending Determination Of Proved Reserves Number Of Wells Pending Determination Of Proved Reserves Asset Retirement Obligation [Abstract] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Discount Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Number of companies after spin-off Number Of Companies After Spin-off Number Of Companies After Spin-off Schedule of Lease Cost Lease, Cost [Table Text Block] Schedule of Balance Sheet Information Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Maturity of Lease Liability, Operating Lessee, Operating Lease, Liability, Maturity [Table Text Block] Maturity of Lease Liability, Financing Finance Lease, Liability, Maturity [Table Text Block] Deferred Tax Assets: Deferred Tax Assets, Net [Abstract] Net Operating Loss- Federal Alternative Minimum Tax Deferred Tax Assets, Operating Loss Carryforwards Foreign Tax Credit Deferred Tax Assets, Tax Credit Carryforwards, Foreign Interest Limitation Deferred Tax Assets, Interest Limitation Deferred Tax Assets, Interest Limitation Gas Well Closing Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Equity Compensation Deferred Tax Assets - Gas Well Closing Deferred Tax Assets - Gas Well Closing Salary Retirement Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Finance Lease Deferred Tax Assets, Property, Plant and Equipment Other Deferred Tax Assets, Other Total Deferred Tax Assets Deferred Tax Assets, Gross Valuation Allowance Net Deferred Tax Assets Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Liabilities: Deferred Tax Liabilities, Gross [Abstract] Property, Plant and Equipment Deferred Tax Liabilities, Property, Plant and Equipment Investment in Partnership Deferred Tax Liabilities, Investment in Noncontrolled Affiliates Gas Derivatives Deferred Tax Liabilities, Derivatives Advance Gas Royalties Deferred Tax Liabilities, Leasing Arrangements Other Deferred Tax Liabilities, Other Total Deferred Tax Liabilities Deferred Tax Liabilities, Gross Net Deferred Tax Liability Deferred Tax Liabilities, Net Operating Lease Cost Operating Lease, Cost Finance Lease Cost: Lease, Cost [Abstract] Amortization of Right-of-Use Assets Finance Lease, Right-of-Use Asset, Amortization Interest on Lease Liabilities Finance Lease, Interest Expense Short-term Lease Cost Short-term Lease, Cost Variable Lease Cost Variable Lease, Cost Total Lease Cost Lease, Cost Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Cash Paid for Amounts Included in the Measurement of Lease Liabilities: Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract] Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract] Operating Cash Flows from Operating Leases Operating Lease, Payments Operating Cash Flows from Finance Leases Finance Lease, Interest Payment on Liability Financing Cash Flows from Finance Leases Finance Lease, Principal Payments Right-of-Use Assets Obtained in Exchange for Lease Obligations: Right-Of-Use Assets Obtained In Exchange For Lease Obligations [Abstract] Right-Of-Use Assets Obtained In Exchange For Lease Obligations [Abstract] Operating Leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Finance Leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Other Significant Noncash Transactions [Table] Other Significant Noncash Transactions [Table] Other Significant Noncash Transactions by Unique Description [Axis] Other Significant Noncash Transaction [Axis] Other Significant Noncash Transaction, Name [Domain] Other Significant Noncash Transaction, Name [Domain] Notes Received from Property Sales Notes Received from Property Sales [Member] Notes Received from Property Sales [Member] Other Significant Noncash Transactions [Line Items] Other Significant Noncash Transactions [Line Items] Capital expenditures incurred, not yet paid Capital Expenditures Incurred but Not yet Paid Interest (Net of Amounts Capitalized) Interest Paid, Excluding Capitalized Interest, Operating Activities Income Taxes Proceeds from Income Tax Refunds Schedule of Changes in Accumulated Postemployment Benefit Obligations Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block] Schedule of Defined Benefit Plans Disclosures Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Schedule of Assumptions Used Defined Benefit Plan, Assumptions [Table Text Block] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Midstream Midstream [Member] Midstream [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Pro Forma Total Revenue and Other Operating Income Business Acquisition, Pro Forma Revenue Pro Forma Net Income from Continuing Operations Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax Less: Pro Forma Net Income Attributable to Noncontrolling Interests Business Acquisition, Pro Forma Income (Loss), Attributable to Non-Controlling Interests Business Acquisition, Pro Forma Income (Loss), Attributable to Non-Controlling Interests Pro Forma Net Income from Continuing Operations Attributable to CNX Business Acquisition, Pro Forma Income (Loss), From Continuing Operations, Attributable to Parent Business Acquisition, Pro Forma Income (Loss), From Continuing Operations, Attributable to Parent Pro Forma Income(Loss) per Share from Continuing Operations (Basic) (in usd per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Pro Forma Income(Loss) per Share from Continuing Operations (Diluted) (in usd per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Payment terms for contract with customers Contracts With Customers, Payment Terms Contracts With Customers, Payment Terms Receivables related to contracts with customers Revolving Credit Facilities Short-term Debt [Text Block] Payment for pension benefits Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 2020 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Year 2025-2029 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Statement of Comprehensive Income [Abstract] Actuarially determined long-term liability adjustments, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Effective Income Tax Rate Reconciliation, Amount [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Statutory U.S. Federal Income Tax Rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Net Effect of State Income Taxes Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount Non-Controlling Interest Uncertain Tax Positions Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Amount Effect of Spin on Federal NOL's Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Amount Accrual to Tax Return Reconciliation Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Effect of Equity Compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount Effect of Change in State Valuation Allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, State, Amount Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, State, Amount Effect of Change in Federal Valuation Allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Federal, Amount Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Federal, Amount Other Deferred Adjustments Effective Income Tax Rate Reconciliation, Other Deferred Adjustments, Amount Effective Income Tax Rate Reconciliation, Other Deferred Adjustments, Amount Effect of Federal and State Rate Reductions Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount Effect of Federal Tax Credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Statutory U.S. Federal Income Tax Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Net Effect of State Income Taxes Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Percent Non-Controlling Interest Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Uncertain Tax Positions Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Percent Effect of Spin on Federal NOL's Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent Accrual to Tax Return Reconciliation Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Effect of Equity Compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent Effect of Change in State Valuation Allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, State, Percent Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, State, Percent Effect of Change in Federal Valuation Allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Federal, Percent Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Federal, Percent Other Deferred Adjustments Effective Income Tax Rate Reconciliation, Other Deferred Adjustments, Percent Effective Income Tax Rate Reconciliation, Other Deferred Adjustments, Percent Effect of Federal and State Rate Reductions Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Effect of Federal Tax Credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Income Tax Expense (Benefit) / Effective Rate Effective Income Tax Rate Reconciliation, Percent Royalties Accrued Royalties Accrued Interest Interest Payable, Current Short-Term Incentive Compensation Employee-related Liabilities Transportation Charges Accrued Transportation Charges Accrued Transportation Charges Deferred Revenue Contract with Customer, Liability, Current Accrued Other Taxes Accrual for Taxes Other than Income Taxes, Current Accrued Payroll & Benefits Accrued Bonuses, Current Other Accrued Liabilities and Other Liabilities Current Portion of Long-Term Liabilities: Liabilities, Other than Long-term Debt, Noncurrent [Abstract] Asset Retirement Obligations Asset Retirement Obligation, Current Salary Retirement Liability, Defined Benefit Pension Plan, Current Total Other Accrued Liabilities Other Accrued Liabilities Gas Gathering Assets Capitalized Costs, Support Equipment and Facilities Gas Wells and Related Equipment Capitalized Costs, Wells and Related Equipment and Facilities Other Gas Assets Capitalized Costs, Other Gas Assets Capitalized Costs, Other Gas Assets Total Property, Plant and Equipment Capitalized Costs, Oil and Gas Producing Activities, Gross Accumulated Depreciation, Depletion and Amortization Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance Relating to Oil and Gas Producing Activities Net Capitalized Costs Capitalized Costs, Oil and Gas Producing Activities, Net Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Anti-Dilutive Options Anti-Dilutive Restricted Stock Units Restricted Stock Units (RSUs) [Member] Anti-Dilutive Performance Share Units Performance Share Units [Member] Performance Share Units Anti-Dilutive Performance Share Options Performance Share Options [Member] Performance Share Options [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from the computation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Maturities of Long-term Debt [Abstract] Maturities of Long-term Debt [Abstract] 2020 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two 2022 Long-term Debt, Maturities, Repayments of Principal in Year Three 2023 Long-term Debt, Maturities, Repayments of Principal in Year Four 2024 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total Long-Term Debt Maturities Long-term Debt, Gross Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Accumulated Defined Benefit Plans Adjustment Attributable to Parent Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Curtailment gain due to plan freeze Change in Benefit Obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Benefit Obligation at Beginning of Period Defined Benefit Plan, Benefit Obligation Actuarial Loss (Gain) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Plan Amendments Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Plan Curtailments Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment Benefits and Other Payments Defined Benefit Plan, Benefit Obligation, Benefits Paid Benefit Obligation at End of Period Change in Plan Assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Fair Value of Plan Assets at Beginning of Period Defined Benefit Plan, Plan Assets, Amount Company Contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Benefits and Other Payments Defined Benefit Plan, Plan Assets, Benefits Paid Fair Value of Plan Assets at End of Period Funded Status: Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] Current Liabilities Liability, Defined Benefit Plan, Current Noncurrent Liabilities Liability, Defined Benefit Plan, Noncurrent Net Obligation Recognized Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Amounts Recognized in Accumulated Other Comprehensive Loss Consist of: Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] Net Actuarial Loss Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Prior Service Cost (Credit) Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Total Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Less: Tax Benefit AOCI Including Portion Attributable to Noncontrolling Interest, Tax Net Amount Recognized Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Projected Benefit Obligation Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation Accumulated Benefit Obligation Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Fair Value of Plan Assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Oil and Gas, Average Sale Price and Production Cost Per Unit [Table] Oil and Gas, Average Sale Price and Production Cost Per Unit [Table] Natural Gas, Per Thousand Cubic Feet Natural Gas and Natural Gas Liquids [Member] Average Sales Price and Production Costs Per Unit of Production [Line Items] (Deprecated 2019-01-31) Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] Production (MMcfe) Total Average Sales Price Before Effects of Commodity Derivative Financial Settlements (per Mcfe) Average Gas Sales Price before effects of financial settlements Average Gas Sales Price before effects of financial settlements Average Effects of Commodity Derivative Financial Settlements (per Mcfe) Average effects of financial settlements (per thousand cubic feet) Average effects of financial settlements (per thousand cubic feet) Total Average Sales Price Including Effects of Commodity Derivative Financial Settlements (per Mcfe) Average gas sales price including effects of financial settlements (per thousand cubic feet) Average gas sales price including effects of financial settlements (per thousand cubic feet) Average Lifting Costs, Excluding Ad Valorem and Severance Taxes (per Mcfe) Average Lifting Costs, Excluding Ad Valorem And Severance Taxes Average Lifting Costs, Excluding Ad Valorem And Severance Taxes Senior Notes due April 2023 Senior Notes due April 2023 [Member] Senior Notes due April 2023 [Member] Senior Notes Due April 2020 Senior Notes Due April 2020 [Member] Senior Notes Due April 2020 [Member] Senior Notes Due March 2021 Senior Notes Due March 2021 [Member] Senior Notes Due March 2021 [Member] Senior Notes Due April 2020 and Senior Notes Due March 2021 Senior Notes Due April 2020 and Senior Notes Due March 2021 [Member] Senior Notes Due April 2020 and Senior Notes Due March 2021 [Member] Unamortized bond discount Debt Instrument, Unamortized Discount Purchase of outstanding debt Debt Instrument, Purchase of Outstanding Debt Debt Instrument, Purchase of Outstanding Debt Gain (loss) on extinguishment of debt Gain (Loss) on Extinguishment of Debt Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Cash Cash [Member] Receivables - Related Party Receivables - Related Party [Member] Receivables - Related Party [Member] Receivables - Third Party Receivables Excluding Third Party [Member] Receivables Excluding Third Party [Member] Other Current Assets Other Current Assets [Member] Property, Plant and Equipment, net Property, Plant and Equipment [Member] Operating Lease ROU Asset Operating Lease, Right-Of-Use Asset [Member] Operating Lease, Right-Of-Use Asset [Member] Other Assets Other Noncurrent Assets [Member] Accounts Payable and Accrued Liabilities Accounts Payable [Member] Accounts Payable - Related Party Accounts Payable - Related Party [Member] Accounts Payable - Related Party [Member] Long-Term Debt Long-term Debt [Member] Current assets Variable Interest Entity, Consolidated, Assets, Current Non-current assets Variable Interest Entity, Consolidated, Assets, Noncurrent Total Assets Variable Interest Entity, Consolidated, Carrying Amount, Assets Liabilities: Liabilities [Abstract] Current liabilities Variable Interest Entity, Consolidated, Liabilities, Current Non-current liabilities Variable Interest Entity, Consolidated, Liabilities, Noncurrent Total Liabilities Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Purchase Commitment Purchase Commitment [Member] Unrecorded Unconditional Purchase Obligation [Line Items] Less than 1 year Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months 1 - 3 years Unrecorded Unconditional Purchase Obligation, Due within Three Years 3 - 5 years Unrecorded Unconditional Purchase Obligation, Due within Five Years More than 5 years Unrecorded Unconditional Purchase Obligation, Due after Five Years Total Purchase Obligations Unrecorded Unconditional Purchase Obligation Net development wells drilled Development Wells Drilled, Net Productive1 Development Wells Drilled, Net Productive1 Net dry development wells drilled Development Wells Drilled, Net Nonproductive1 Development Wells Drilled, Net Nonproductive1 Net exploratory wells drilled Exploratory Wells Drilled, Net Productive1 Exploratory Wells Drilled, Net Productive1 Net development wells drilled but uncompleted Net Development Wells, Drilled But Uncompleted Net Development Wells, Drilled But Uncompleted Exploratory wells drilled but uncompleted Exploratory Wells, Drilled But Uncompleted Exploratory Wells, Drilled But Uncompleted Net developmental wells completed, awaiting tie-in to production Net Developmental Wells, Completed, Awaiting Tie-In To Production Net Developmental Wells, Completed, Awaiting Tie-In To Production Gas delivery commitment, remaining contractual volume Oil and Gas, Delivery Commitment, Quantity Committed Cash Consideration CNX Gathering Cash on Hand at January 3, 2018 Distributed to Noble Business Combination, Consideration Transferred, Other Fair Value of Previously Held Equity Interest Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value Total Estimated Fair Value of Consideration Transferred Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination Cover page. Document Information [Table] Document Information [Table] Preferred Share Purchase Rights Preferred Share Purchase Rights [Member] Preferred Share Purchase Rights [Member] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Document Annual Report Document Annual Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol No Trading Symbol Flag No Trading Symbol Flag Security Exchange Name Security Exchange Name Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Reportable Subsegments Reportable Subsegments [Member] Corporate, Non-Segment Corporate, Non-Segment [Member] Major Customers [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Direct Energy Business Marketing LLC Direct Energy Business Marketing LLC [Member] Direct Energy Business Marketing LLC [Member] NJR Energy Services Company NJR Energy Services Company [Member] NJR Energy Services Company [Member] Natural Gas, NGLs and Oil Sales Oil and Gas [Member] Midstream Revenue Subsegments [Axis] Subsegments [Axis] Subsegments [Domain] Subsegments [Domain] Marcellus Shale Marcellus Shale [Member] Marcellus Shale Utica Shale Utica Shale [Member] Utica Shale [Member] Coalbed Methane Coalbed Methane [Member] Coalbed Methane Other Gas Other Gas [Member] Other Gas Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of divisions Number of Operating Segments Number of reportable segments Number of Reportable Segments Interest in equity method investment Equity Method Investment, Ownership Percentage Revenue (Loss) Gain on Commodity Derivative Instruments Earnings (Loss) From Continuing Operations Before Income Tax Income (Loss) from Continuing Operations before Income Taxes, Domestic Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization Capital Expenditures Segment Reporting - Capital Expenditures Segment Reporting - Capital Expenditures Equity in Earnings of Affiliates Investments in Unconsolidated Equity Affiliates Equity Method Investments Supplemental Gas Data (unaudited) Oil and Gas Exploration and Production Industries Disclosures [Text Block] Propane Propane [Member] Commodity Swaps Commodity [Member] Natural Gas Basis Swaps Basis Swap [Member] Cash Received (Paid) in Settlement of Commodity Derivative Instruments: Gain (Loss) on Sale of Commodity Contracts Unrealized Gain (Loss) on Commodity Derivative Instruments: Unrealized Gain (Loss) on Derivatives and Commodity Contracts Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Reconciliation of Revenue from Segments to Consolidated Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Reconciliation of Operating Profit (Loss) from Segments to Consolidated Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Reconciliation of Assets and Liabilities from Segment to Consolidated Reconciliation of Assets from Segment to Consolidated [Table Text Block] Income Statement [Abstract] Natural Gas, NGLs and Oil Revenue Transportation, Gathering and Compression Natural Gas, Gathering, Transportation, Marketing and Processing [Member] Exploration and Production Related Other Costs Oil and Gas, Exploration and Production [Member] Costs and Expenses: Operating Costs and Expenses [Abstract] Operating Expense Operating Expenses [Abstract] Lease Operating Expense Operating Lease, Expense Cost of Goods and Services Sold Cost of Goods and Services Sold Depreciation, Depletion and Amortization E&P Depreciation, Depletion, and Amortization E&P Depreciation, Depletion, and Amortization Purchased Gas Costs Production Royalty Interests and Purchased Gas Costs Production Royalty Interests and Purchased Gas Costs Impairment of Other Intangible Assets Impairment of Intangible Assets, Finite-lived Selling, General and Administrative Costs Results of Operations, General and Administrative Related to Oil and Gas Producing Activities Other Operating Expense Other Expenses Total Operating Expense Operating Expenses Other Expense (Income) Other Nonoperating Income (Expense) [Abstract] Other Expense (Income) Other Nonoperating Income (Expense) Gain on Asset Sales and Abandonments, net Gain on Previously Held Equity Interest Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain Loss on Debt Extinguishment Total Other Expense (Income) Nonoperating Income (Expense) Earnings from Continuing Operations Before Income Tax Income Tax Expense (Benefit) Income from Discontinued Operations, net Net Income Basic Earnings Per Share, Basic [Abstract] Income (Loss) from Continuing Operations (in usd per share) Income (Loss) from Discontinued Operations (in usd per share) Diluted Earnings Per Share, Diluted [Abstract] Income (Loss) from Continuing Operations (in usd per share) Income (Loss) from Discontinued Operations (in usd per share) Dividends Declared Per Share (in usd per share) Common Stock, Dividends, Per Share, Cash Paid Accounting Policies [Abstract] Basis of Consolidation Consolidation, Policy [Policy Text Block] Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Trade Accounts Receivable Accounts Receivable [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Impairment of Proved and Unproved Properties Property, Plant and Equipment, Impairment [Policy Text Block] Impairment of Goodwill and Definite-Lived Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Asset Retirement Obligations Asset Retirement Obligation [Policy Text Block] Investment Plan Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Contingencies Commitments and Contingencies, Policy [Policy Text Block] Stock-Based Compensation Share-based Payment Arrangement [Policy Text Block] Accounting for Derivative Instruments Derivatives, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Subsequent Events Subsequent Events, Policy [Policy Text Block] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Income (Loss) Gain on Certain Asset Sales Gain on Certain Asset Sales Gain on Previously Held Equity Interest Equity Method Investment, Realized Gain (Loss) on Disposal Loss on Debt Extinguishment Impairment of Other Intangible Assets Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward] Balance at Beginning of Period Net Changes in Sales Prices and Production Costs Net Increase (Decrease) in Sales and Transfer Prices and Production Costs Sales Net of Production Costs Sales and Transfers of Oil and Gas Produced, Net of Production Costs Net Change Due to Revisions in Quantity Estimates Revisions of Previous Quantity Estimates Net Change Due to Extensions, Discoveries and Improved Recovery Extensions, Discoveries, Additions and Improved Recovery, Less Related Costs Development Costs Incurred During the Period Previously Estimated Development Costs Incurred Difference in Previously Estimated Development Costs Compared to Actual Costs Incurred During the Period Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Other Purchase of Reserves In-Place Increase Due to Purchases of Minerals in Place Sales of Reserves In-Place Decrease Due to Sales of Minerals in Place Changes in Estimated Future Development Costs Changes in Estimated Future Development Costs Net Change in Future Income Taxes Changes in Future Income Tax Expense Estimates on Future Cash Flows Related to Proved Oil and Gas Reserves Timing and Other Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Timing and Other Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Timing and Other Accretion Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves, Accretion of Discount Total standardized measure of discounted net cash flows Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Shares of Common Stock Outstanding Schedule of Stock by Class [Table Text Block] Basis Only Swaps Asset Derivative Instruments Derivative Asset [Abstract] Current Assets Other Assets Total Asset Liability Derivative Instruments Derivative Liability [Abstract] Current Liabilities Non-Current Liabilities Total Liability Derivative Liability Preferred Stock Preferred Stock [Member] Common Stock, Par Value (in usd per share) Common Stock, Par or Stated Value Per Share Common Stock, Shares Authorized (in shares) Common Stock, Shares Authorized Common Stock, Issued (in shares) Common Stock, Shares, Issued Common Stock, Outstanding (in shares) Preferred Stock, Authorized (in shares) Preferred Stock, Shares Authorized Preferred Stock, Issued (in shares) Preferred Stock, Shares Issued Preferred Stock, Outstanding (in shares) Preferred Stock, Shares Outstanding Midstream Revenue Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Earnings from Continuing Operations Before Income Tax Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Natural Gas Commodity Swaps (Bcf) Natural Gas Basis Swaps (Bcf) Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivative notional amount Derivative, Nonmonetary Notional Amount, Volume Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Share-based Compensation, Stock Options, Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Schedule of Nonvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Schedule of Nonvested Performance-based Units Activity Schedule of Nonvested Performance-based Units Activity [Table Text Block] Schedule of Property, Plant and Equipment, Useful Lives Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario [Domain] Forecast Forecast [Member] Partners' Capital Account Transaction Name [Axis] Partners' Capital Account Transaction Name [Axis] Partners' Capital Account Transaction Name [Axis] Partners' Capital Account Transaction Name [Domain] Partners' Capital Account Transaction Name [Domain] [Domain] for Partners' Capital Account Transaction Name [Axis] IDR Elimination Transaction IDR Elimination Transaction [Member] IDR Elimination Transaction [Member] Limited Partners' Capital Account by Class [Axis] Limited Partners' Capital Account by Class [Axis] Limited Partners' Capital Account, Class [Domain] Limited Partners' Capital Account, Class [Domain] Common Units Common Units [Member] Common Units [Member] Capital Unit, Class B Capital Unit, Class B [Member] Limited Partner Limited Partner [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] CNX Midstream GP LLC CNX Midstream GP LLC [Member] CNX Midstream GP LLC [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Limited Partners' capital account, issued (in units) Partners' Capital Account, Consideration Transferred, Equity Interests Issued Partners' Capital Account, Consideration Transferred, Equity Interests Issued Consideration to be received Noncash or Part Noncash Divestiture, Amount of Consideration Received Incentive distribution receivable, due next twelve months Incentive Distribution Receivable, Due Next Twelve Months Incentive Distribution Receivable, Due Next Twelve Months Incentive distribution receivable, due in two years Incentive Distribution Receivable, Due In Two Years Incentive Distribution Receivable, Due In Two Years Incentive distribution receivable, due in three years Incentive Distribution Receivable, Due In Three Years Incentive Distribution Receivable, Due In Three Years Limited partnership interests (in units) Units of Partnership Interest, Amount Schedule of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Changes in Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Statement of Cash Flows [Abstract] CNX Senior Notes CNX Senior Notes [Member] CNX Senior Notes [Member] CNXM Senior Notes CNXM Senior Notes [Member] CNXM Senior Notes [Member] Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to Reconcile Net Income to Net Cash Provided by Continuing Operating Activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net Income from Discontinued Operations Amortization of Deferred Financing Costs Amortization of Other Deferred Charges Impairment of Exploration and Production Properties Impairment of Exploration and Production Properties Impairment of Exploration and Production Properties Impairment of Unproved Properties and Expirations Stock-Based Compensation Share-based Payment Arrangement, Noncash Expense Gain on Asset Sales and Abandonments, net Gain (Loss) on Disposition of Other Assets Loss on Debt Extinguishment (Gain) Loss on Commodity Derivative Instruments Net Cash Received (Paid) in Settlement of Commodity Derivative Instruments Increase (Decrease) Cash Collateral from Counterparties Deferred Income Taxes Equity in Earnings of Affiliates Return on Equity Investment Proceeds from Equity Method Investment, Distribution Changes in Operating Assets: Increase (Decrease) in Operating Assets [Abstract] Accounts and Notes Receivable Increase (Decrease) in Accounts and Notes Receivable Supplies Inventories Increase (Decrease) in Inventories Recoverable Income Taxes Increase (Decrease) in Income Taxes Prepaid Expenses Increase (Decrease) in Prepaid Expense Changes in Other Assets Increase (Decrease) in Other Operating Assets Changes in Operating Liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Accounts Payable Increase (Decrease) in Accounts Payable Accrued Interest Increase (Decrease) in Interest Payable, Net Other Operating Liabilities Increase (Decrease) in Other Operating Liabilities Changes in Other Liabilities Increase (Decrease) in Other Accrued Liabilities Net Cash Provided by Continuing Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net Cash Provided by Discontinued Operating Activities Cash Provided by (Used in) Operating Activities, Discontinued Operations Net Cash Provided by Operating Activities Cash Flows from Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Capital Expenditures CNX Gathering LLC Acquisition, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Proceeds from Asset Sales Proceeds from Sale of Productive Assets Net Distributions from Equity Affiliates Proceeds Of Distributions From Equity Affiliates, Investing Activities Proceeds Of Distributions From Equity Affiliates, Investing Activities Net Cash Used in Continuing Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net Cash Used in Discontinued Investing Activities Cash Provided by (Used in) Investing Activities, Discontinued Operations Net Cash Used in Investing Activities Cash Flows from Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net Proceeds from CNX Revolving Credit Facility Proceeds from Short-term Debt Payments on Miscellaneous Borrowings Repayments of Other Debt Payments on Long-Term Notes Payments On Long Term Notes Including Redemption Premium Payments On Long Term Notes Including Redemption Premium Proceeds from Issuance of Senior Notes Proceeds from Issuance of Long-term Debt Net Proceeds from (Payments on) CNXM Revolving Credit Facility Net Proceeds from Revolver - MLP Net Proceeds from Revolver - MLP Distributions to CNXM Noncontrolling Interest Holders Payments to Noncontrolling Interests Proceeds from Spin-Off of CONSOL Energy Inc. Proceeds from Sales of Business, Affiliate and Productive Assets Proceeds from Issuance of Common Stock Proceeds from Issuance of Common Stock Shares Withheld for Taxes Payment, Tax Withholding, Share-based Payment Arrangement Purchases of Common Stock Payments for Repurchase of Common Stock Debt Issuance and Financing Fees Payments of Debt Issuance Costs Net Cash Provided by (Used in) Continuing Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net Cash Used in Discontinued Financing Activities Cash Provided by (Used in) Financing Activities, Discontinued Operations Net Cash Provided by (Used in) Financing Activities Net (Decrease) Increase in Cash and Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and Cash Equivalents at Beginning of Period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and Cash Equivalents at End of Period Gross Wells And Acreage, Gross [Abstract] Wells And Acreage, Gross [Abstract] Producing Gas Wells (including Gob Wells) Gas, Productive Well, Number of Wells, Gross Producing Oil Wells Oil, Productive Well, Number of Wells, Gross Proved Developed Acreage Oil and Gas, Developed Acreage, Gross Proved Undeveloped Acreage Oil and Gas, Undeveloped Acreage, Gross Unproved Acreage Unproved Acreage Gross unproved acreage gross Total Acreage Total Acreage - Gross Total acreage Net Wells And Acreage, Net [Abstract] Wells And Acreage, Net [Abstract] Producing Gas Wells (including Gob Wells) Gas, Productive Well, Number of Wells, Net Producing Oil Wells Oil, Productive Well, Number of Wells, Net Proved Developed Acreage Oil and Gas, Developed Acreage, Net Proved Undeveloped Acreage Oil and Gas, Undeveloped Acreage, Net Unproved Acreage Gas and Oil Acreage, Unproved, Net Gas and Oil Acreage, Unproved, Net Total Acreage Total Acreage - Net Total Acreage - Net Quarterly Financial Information Quarterly Financial Information [Table Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Subsequent Events Subsequent Events [Text Block] Leases Lessee, Finance Leases [Text Block] Leases Lessee, Operating Leases [Text Block] Operating Leases: Operating Lease, Lease Income [Abstract] Total Operating Lease Liabilities Finance Leases: Lessee, Finance Lease, Description [Abstract] Property, Plant and Equipment Less—Accumulated Depreciation, Depletion and Amortization Property, Plant and Equipment—Net Finance Lease, Right-of-Use Asset Current Portion of Finance Lease Obligations Finance Lease, Liability, Current Finance Lease Obligations Total Finance Lease Liabilities Schedule of Goodwill [Table] Schedule of Goodwill [Table] Midstream Acquisition Midstream Acquisition [Member] Midstream Acquisition [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill acquired during period Goodwill, Acquired During Period Other intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Impairment of intangible assets Useful life, customer relationship intangible assets Finite-Lived Intangible Asset, Useful Life Amortization expense Amortization of Intangible Assets Estimated annual amortization expense expected, 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Estimated annual amortization expense expected, 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two Estimated annual amortization expense expected, 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three Estimated annual amortization expense expected, 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four Estimated annual amortization expense expected, 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Coal Revenue Disposal Group, Including Discontinued Operations, Coal Sales Disposal group, including discontinued operations, coal sales Other Outside Sales Disposal Group, Including Discontinued Operations, Other Outside Sales Disposal Group, Including Discontinued Operations, Other Outside Sales Freight-Outside Coal Disposal Group, Including Discontinued Operations, Cargo and Freight Revenue Miscellaneous Other Income Disposal Group, Including Discontinued Operation, Other Income Total Revenue and Other Income Disposal Group, Including Discontinued Operation, Revenue Total Costs Disposal Group, Including Discontinued Operation, Operating Expense Income from Operations Before Income Taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income Tax Expense Discontinued Operation, Tax Effect of Discontinued Operation Less: Net Income Attributable to Noncontrolling Interest Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest Income from Discontinued Operations, net Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Central Pennsylvania Central Pennsylvania [Member] Central Pennsylvania [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Knox and Coalfield Knox and Coalfield [Member] Knox and Coalfield [Member] Proved Properties Proved Properties [Member] Proved Properties [Member] Unproved Properties Unproved Properties [Member] Unproved Properties [Member] Building and Improvements Building and Building Improvements [Member] Machinery and Equipment Machinery and Equipment [Member] Gathering and Transmission Gathering and Transmission [Member] Gathering and Transmission [Member] Useful life of property, plant and equipment Property, Plant and Equipment, Useful Life Net acres of land Area of Land Impairment of long-lived assets Impairment of Long-Lived Assets to be Disposed of Impairment of proved and unproved properties Exploration expense Percentage of fair value in excess of carrying amount (less than) Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount Goodwill impairment test, measurement period Goodwill Impairment Test, Measurement Period Goodwill Impairment Test, Measurement Period Company's matching contribution, percentage Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Discretionary contributions to the Plan, percentage Defined Contribution Plan, Employer Discretionary Contribution Percent Defined Contribution Plan, Employer Discretionary Contribution Percent Discretionary contributions to the Plan, amount Defined Contribution Plan, Employer Discretionary Contribution Amount Total payment and cost to the Plan Defined Contribution Plan, Cost SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Schedule II - Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Firm Transportation Firm Transportation [Member] Firm Transportation [Member] Other Other Commitments [Member] Other Commitments Employee-Related Employee Related Commitments [Member] Employee Related Commitments Environmental Environment Related Commitments [Member] Environment Related Commitments Financial Guarantees Financial Guarantee [Member] Purchase Commitment, Excluding Long-term Commitment [Axis] Purchase Commitment, Excluding Long-term Commitment [Axis] Purchase Commitment, Excluding Long-term Commitment [Domain] Purchase Commitment, Excluding Long-term Commitment [Domain] Less Than 1 Year Balance on First Anniversary [Member] Balance on First Anniversary [Member] 1-3 Years More Than One And Within Three Years From Balance Sheet Date [Member] More than One and within Three Years from Balance Sheet Date 3-5 Years More Than Three And Within Five Years From Balance Sheet Date [Member] More than Three and within Five Years from Balance Sheet Date Beyond 5 Years Beyond Five Years of Balance Sheet Date [Member] Beyond Five Years of Balance Sheet Date [Member] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Letters of Credit: Standby Letters of Credit [Member] Surety Bonds: Surety Bond [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Maximum potential total of future payments under commitments Guarantor Obligations, Maximum Exposure, Undiscounted Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Accounts Receivable Accounts Receivable [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Gas Wholesalers Gas Customers [Member] Gas Customers [Member] NGL, Condensate & Processing Facilities NGL, Condensate And Processing Facilities [Member] NGL, Condensate And Processing Facilities [Member] Other Other Customers [Member] Other Customers Concentration Risk [Line Items] Concentration Risk [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] State Operating Loss Carry-Forwards SEC Schedule, 12-09, Valuation Allowance, Operating Loss Carryforward [Member] Deferred Deductible Temporary Differences SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] Charitable Contributions SEC Schedule, 12-09, Valuation Allowance, Charitable Contributions [Member] SEC Schedule, 12-09, Valuation Allowance, Charitable Contributions [Member] 162(m) Officers Compensation SEC Schedule, 12-09, Valuation Allowance, Officers Compensation [Member] SEC Schedule, 12-09, Valuation Allowance, Officers Compensation [Member] AMT Credit SEC Schedule, 12-09, Valuation Allowance, Alternative Minimum Tax Credit Carryforward [Member] SEC Schedule, 12-09, Valuation Allowance, Alternative Minimum Tax Credit Carryforward [Member] Foreign Tax Credits SEC Schedule, 12-09, Valuation Allowance, Foreign Tax Credit [Member] SEC Schedule, 12-09, Valuation Allowance, Foreign Tax Credit [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Charged to expense - additions SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Release of valuation allowance - deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Charged to expense - deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment Balance at end of period Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] CONE Midstream GP LLC CONE Midstream GP LLC [Member] CONE Midstream GP LLC [Member] Disposal Group Name [Domain] Ohio Utica Joint Venture Assets Ohio Utica Joint Venture Assets [Member] Ohio Utica Joint Venture Assets [Member] Asset Exchange Agreement with HG Energy Asset Exchange Agreement with HG Energy [Member] Asset Exchange Agreement with HG Energy [Member] Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia [Member] Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia [Member] Surface Land, Colorado Surface Land, Colorado [Member] Surface Land, Colorado [Member] Marcellus Shale Acres, Allegheny and Westmoreland County Marcellus Shale Acres, Allegheny and Westmoreland County [Member] Marcellus Shale Acres, Allegheny and Westmoreland County [Member] Marcellus And Utica Shale, Allegheny, Washington And Westmoreland Counties Marcellus And Utica Shale, Allegheny, Washington And Westmoreland Counties [Member] Marcellus And Utica Shale, Allegheny, Washington And Westmoreland Counties [Member] Marcellus And Utica Acres, Doddridge And Wetzel Counties Marcellus And Utica Acres, Doddridge And Wetzel Counties [Member] Marcellus And Utica Acres, Doddridge And Wetzel Counties [Member] Utica Point Pleasant Shale Acres, Jefferson, Belmont And Guernsey Counties Utica Point Pleasant Shale Acres, Jefferson, Belmont And Guernsey Counties [Member] Utica Point Pleasant Shale Acres, Jefferson, Belmont And Guernsey Counties [Member] Proceeds from sale of assets Net gain (loss) on sale Cash proceeds from Asset Exchange Agreement Proceeds from Asset Exchange Agreement Proceeds from Asset Exchange Agreement Number of wells added to existing commitment Business Acquisition, Number Of Additional Wells Added Business Acquisition, Number Of Additional Wells Added Impairment of other intangibles Cash consideration received in sale of oil and gas assets Disposal Group, Including Discontinued Operation, Consideration Asset retirement obligations assumed Disposal Group, Including Discontinued Operations, Asset Retirement Obligations Assumed Disposal Group, Including Discontinued Operations, Asset Retirement Obligations Assumed Ownership percentage in equity method investment Fair value of previously held equity interest Gain on remeasurement of fair value of previously held equity interest Proceeds sale of land Proceeds from Sale of Property, Plant, and Equipment Drilled but uncompleted wells Business Combination, Wells Drilled, Uncompleted Business Combination, Wells Drilled, Uncompleted Proceeds from sale of subsidiary, previously classified as held for sale Proceeds from Divestiture of Interest in Consolidated Subsidiaries Impairment on Assets Held for Sale Southeastern Asset Management, Inc. Southeastern Asset Management, Inc. [Member] Southeastern Asset Management, Inc. [Member] Grantee Status [Axis] Grantee Status [Axis] Grantee Status [Domain] Grantee Status [Domain] Employee Share-based Payment Arrangement, Employee [Member] Title of Individual [Axis] Title of Individual [Axis] Title of Individual [Domain] Title of Individual [Domain] Director Director [Member] Award Type [Axis] Award Type [Domain] Restricted Stock Units Performance Share Units Restricted Stock Units and Performance Share Units Restricted Stock Units And Performance Share Units [Member] Restricted Stock Units And Performance Share Units Board Approved Share Increase Board Approved Share Increase [Member] Board Approved Share Increase [Member] Performance Options Performance Options [Member] Performance Options Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Tranche One Share-based Payment Arrangement, Tranche One [Member] Tranche Two Share-based Payment Arrangement, Tranche Two [Member] Tranche Three Share-based Payment Arrangement, Tranche Three [Member] Tranche Four Share-Based Compensation Award, Tranche Four [Member] Share-Based Compensation Award, Tranche Four [Member] Tranche Five Share-Based Compensation Award, Tranche Five [Member] Share-Based Compensation Award, Tranche Five [Member] Accelerated Vesting Accelerated Vesting [Member] Accelerated Vesting [Member] Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] Granted 2015 Granted 2015 [Member] Granted 2015 [Member] Granted 2016-2018 Granted 2016-2018 [Member] Granted 2016-2018 [Member] Number of shares approved for increase in available for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Common stock available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Award conversation ratio Share-based Compensation Arrangement by Share-based Payment Award, Award Conversation Ratio Share-based Compensation Arrangement by Share-based Payment Award, Award Conversation Ratio Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Award vesting rights percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Ownership percentage in equity method investment Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Long-term equity-based compensation expense Share-based Payment Arrangement, Accelerated Cost Stock-based compensation expense Share-based Payment Arrangement, Expense Unrecognized compensation cost related to nonvested awards Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Recognition period, weighted average Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Fair value of options granted during the year Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture Options outstanding (in shares) Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Cash received from option exercises Proceeds from Stock Options Exercised Tax impact from option exercises Excess Tax Benefit from Share-based Compensation, Financing Activities Fair value of RSUs granted during the year Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Fair value of restricted stock units vested during the year Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Fair value of performance share units vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Te Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Te Weighted average exercise price (in usd per share) Other Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Net Income (Loss) Attributable to Parent [Abstract] Other Comprehensive (Loss) Income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Actuarially Determined Long-Term Liability Adjustments (Net of tax: $1,664, ($792), ($7,365)) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive Income Attributable to Noncontrolling Interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Comprehensive (Loss) Income Attributable to CNX Resources Shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Actuarially Determined Long-Term Liability Adjustments (Note 16) Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Amortization of Prior Service Costs Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Recognized Net Actuarial Loss Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification from AOCI before tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Reclassification from AOCI, tax (benefit) Reclassification from AOCI, Current Period, Tax Net of Tax Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Long-term Purchase Commitment Long-term Purchase Commitment [Table Text Block] Unrecorded Unconditional Purchase Obligations Disclosure Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] Sales Costs and Expenses Net (Loss) Income Attributable to CNX Resources Shareholders (Loss) Earnings Per Share Basic earnings per share (in usd per share) Diluted earnings per share (in usd per share) Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block] Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure [Table Text Block] Results of Operations for Oil and Gas Producing Activities Disclosure Results of Operations for Oil and Gas Producing Activities Disclosure [Table Text Block] Oil and Gas Net Production, Average Sales Price and Average Production Costs Disclosure Oil and Gas, Average Sale Price and Production Cost [Table Text Block] Schedule of Gas and Oil Acreage Oil and Gas, Acreage [Table Text Block] Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table Text Block] Schedule of Aging of Capitalized Exploratory Well Costs Schedule of Aging of Capitalized Exploratory Well Costs [Table Text Block] Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure [Table Text Block] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at Beginning of Period Unrecognized Tax Benefits Reduction in Unrecognized Tax Benefits Because of the Lapse of the Applicable Statute of Limitations Balance at End of Period Earnings Per Share Earnings Per Share [Text Block] Schedule of Change in Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Long-Term Debt (Excluding Debt Issuance Costs) Fair Value of Assets Acquired: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Cash and Cash Equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Accounts and Notes Receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Notes and Accounts Receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Notes and Accounts Receivables Prepaid Expense Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Other Current Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Property, Plant and Equipment, Net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Intangible Assets Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Total Assets Acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Fair Value of Liabilities Assumed: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Accounts Payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable CNXM Revolving Credit Facility Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt Total Liabilities Assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Total Identifiable Net Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Fair Value of Noncontrolling Interest in CNXM Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Net Assets Acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Segment Information Segment Reporting Disclosure [Text Block] Share-based Payment Arrangement [Abstract] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning nonvested balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period PSUs issued as a result of 200% payout (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued In Period, Result of Payout Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued In Period, Result of Payout Vested (in shares) Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Ending nonvested balance (in shares) Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning nonvested balance (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value PSUs issued as a result of 200% payout (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued In Period, Result of Payout, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued In Period, Result of Payout, Weighted Average Grant Date Fair Value Vested (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Ending nonvested balance (in usd per share) Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Balance, Beginning of Year Asset Retirement Obligation Obligations Divested Asset Retirement Obligation, Liabilities Settled Accretion Expense Accretion Expense Obligations Incurred Asset Retirement Obligation, Liabilities Incurred Obligations Settled Asset Retirement Obligation, Cash Paid to Settle Revisions in Estimated Cash Flows Asset Retirement Obligation, Revision of Estimate Balance, End of Year Prior Service Cost Recognition Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year Actuarial Loss Recognition Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year Significant Accounting Policies Significant Accounting Policies [Text Block]