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Guarantor Subsidiaries, Condensed Statement of Cash Flows (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | $ 970,706,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | $ 553,570,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | $ 457,342,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Provided by (Used in) Operating Activities, Discontinued Operations | (33,926,000)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | 105,206,000 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | 270,771,000 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net Cash Provided by Operating Activities | 936,780,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 658,776,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 728,113,000 us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities: |  |  |
Capital Expenditures | (1,493,425,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (1,496,056,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (1,245,497,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from Sales of Assets | 356,836,000 us-gaap_ProceedsFromSaleOfProductiveAssets | 483,969,000 us-gaap_ProceedsFromSaleOfProductiveAssets | 645,621,000 us-gaap_ProceedsFromSaleOfProductiveAssets
Increase (Decrease) in Restricted Cash | 0 us-gaap_IncreaseDecreaseInRestrictedCash | 68,673,000 us-gaap_IncreaseDecreaseInRestrictedCash | (48,294,000)us-gaap_IncreaseDecreaseInRestrictedCash
Net Investment in Equity Affiliates | 95,207,000 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates | (35,712,000)us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates | (23,451,000)us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates
Net Cash Provided by (Used in) Investing Activities, Continuing Operations | (1,041,382,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (979,126,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (671,621,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Provided by (Used in) Investing Activities, Discontinued Operations | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations | 777,145,000 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations | (328,789,000)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net Cash Used in Investing Activities | (1,041,382,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (201,981,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (1,000,410,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities: |  |  |
Repayments of Other Debt | (22,022,000)us-gaap_RepaymentsOfOtherDebt | (31,544,000)us-gaap_RepaymentsOfOtherDebt | 16,195,000 us-gaap_RepaymentsOfOtherDebt
Payments On Long Term Notes Including Redemption Premium | 1,843,866,000 cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium | 0 cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium | 0 cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium
Proceeds from Issuance of Long-Term Notes | 1,859,920,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities | 2,629,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 2,929,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 8,678,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Payments on Securitzation Facility | 0 us-gaap_ProceedsFromIssuanceOfSecuredDebt | (37,846,000)us-gaap_ProceedsFromIssuanceOfSecuredDebt | 37,846,000 us-gaap_ProceedsFromIssuanceOfSecuredDebt
Dividends Paid | (57,506,000)us-gaap_PaymentsOfDividends | (85,832,000)us-gaap_PaymentsOfDividends | (142,278,000)us-gaap_PaymentsOfDividends
(Payments on) Proceeds from Short-Term Borrowings |  | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt |
Proceeds from Issuance of Common Stock | 15,016,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 3,727,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 8,278,000 us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from Issuance of Common Stock |  | 3,727,000 us-gaap_ProceedsFromContributionsFromParent |
Other Financing Activities | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | 778,000 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | 53,024,000 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net Cash Provided by (Used in) Financing Activities, Continuing Operations | (45,829,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (150,717,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (80,976,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Cash Provided by (Used in) Financing Activities, Discontinued Operations | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations | (520,000)us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations | (601,000)us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations
Net Cash (Used in) Provided by Financing Activities | (45,829,000)us-gaap_NetCashProvidedByUsedInFinancingActivities | (151,237,000)us-gaap_NetCashProvidedByUsedInFinancingActivities | (81,577,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Parent Issuer |  |  |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | (178,921,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 51,093,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (58,410,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Provided by (Used in) Operating Activities, Discontinued Operations | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Cash Provided by Operating Activities | (178,921,000)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 51,093,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (58,410,000)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investing Activities: |  |  |
Capital Expenditures | 4,420,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 68,796,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 49,973,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from Sales of Assets | 44,049,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 327,964,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Increase (Decrease) in Restricted Cash |  | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Investment in Equity Affiliates | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (200,000,000)us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Cash Provided by (Used in) Investing Activities, Continuing Operations | 39,629,000 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 259,168,000 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 150,027,000 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Cash Used in Investing Activities |  | 259,168,000 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 150,027,000 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Financing Activities: |  |  |
Repayments of Other Debt | 12,135,000 us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25,952,000 us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Payments On Long Term Notes Including Redemption Premium | 1,843,866,000 cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Proceeds from Issuance of Long-Term Notes | 1,859,920,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities | 2,629,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Payments on Securitzation Facility |  | 0 us-gaap_ProceedsFromIssuanceOfSecuredDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Dividends Paid | 57,506,000 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (14,168,000)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 142,278,000 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Payments on) Proceeds from Short-Term Borrowings |  | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Proceeds from Issuance of Common Stock | 15,016,000 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 8,278,000 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from Issuance of Common Stock |  | 3,727,000 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other Financing Activities | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 778,000 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22,532,000 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Cash Provided by (Used in) Financing Activities, Continuing Operations | (35,942,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,279,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (111,468,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Provided by (Used in) Financing Activities, Discontinued Operations |  | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Cash (Used in) Provided by Financing Activities |  | (7,279,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (111,468,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cnx Gas Guarantor [Member] |  |  |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | 567,851,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 440,763,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 82,036,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Cash Provided by (Used in) Operating Activities, Discontinued Operations | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Net Cash Provided by Operating Activities | 567,851,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 440,763,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 82,036,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Investing Activities: |  |  |
Capital Expenditures | 1,103,656,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 968,607,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 532,636,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Proceeds from Sales of Assets | 92,507,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 350,975,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 360,129,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Increase (Decrease) in Restricted Cash |  | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Net Investment in Equity Affiliates | (85,248,000)us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 47,500,000 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 37,400,000 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Net Cash Provided by (Used in) Investing Activities, Continuing Operations | (925,901,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | (665,132,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | (209,907,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Net Cash Used in Investing Activities |  | (665,132,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | (209,907,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Financing Activities: |  |  |
Repayments of Other Debt | (387,663,000)us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 0 us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember |
Payments On Long Term Notes Including Redemption Premium | 0 cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember |  |
Proceeds from Issuance of Long-Term Notes | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember |  |
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember |  |
Payments on Securitzation Facility |  | 0 us-gaap_ProceedsFromIssuanceOfSecuredDebt / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember |
Dividends Paid | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 100,000,000 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 200,000,000 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
(Payments on) Proceeds from Short-Term Borrowings |  | 332,487,000 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember |
Proceeds from Issuance of Common Stock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember |  | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Proceeds from Issuance of Common Stock |  | 0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember |
Other Financing Activities | (5,169,000)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | (5,232,000)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | (5,504,000)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Net Cash Provided by (Used in) Financing Activities, Continuing Operations | 382,494,000 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 227,255,000 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | (205,504,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Cash Provided by (Used in) Financing Activities, Discontinued Operations |  | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Net Cash (Used in) Provided by Financing Activities |  | 227,255,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember | (205,504,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = cnx_CnxGasGuarantorMember
Other Subsidiary Guarantors |  |  |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | 157,211,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 572,683,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 412,293,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Cash Provided by (Used in) Operating Activities, Discontinued Operations | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Net Cash Provided by Operating Activities | 157,211,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 572,683,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 412,293,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Investing Activities: |  |  |
Capital Expenditures | 385,349,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 458,653,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 662,888,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Proceeds from Sales of Assets | 220,267,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | (195,082,000)us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 285,238,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Increase (Decrease) in Restricted Cash |  | (68,673,000)us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 48,294,000 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Net Investment in Equity Affiliates | (9,959,000)us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | (11,788,000)us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | (13,949,000)us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Net Cash Provided by (Used in) Investing Activities, Continuing Operations | (155,123,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | (573,274,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | (411,995,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Net Cash Used in Investing Activities |  | (573,274,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | (411,995,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Financing Activities: |  |  |
Repayments of Other Debt | 7,257,000 us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 4,800,000 us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember |
Payments On Long Term Notes Including Redemption Premium | 0 cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember |  |
Proceeds from Issuance of Long-Term Notes | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember |  |
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember |  |
Payments on Securitzation Facility |  | 0 us-gaap_ProceedsFromIssuanceOfSecuredDebt / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember |
Dividends Paid | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
(Payments on) Proceeds from Short-Term Borrowings |  | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember |
Proceeds from Issuance of Common Stock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember |  | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Proceeds from Issuance of Common Stock |  | 0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember |
Other Financing Activities | 5,169,000 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 5,232,000 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | (1,408,000)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Net Cash Provided by (Used in) Financing Activities, Continuing Operations | (2,088,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 432,000 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | (1,408,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Cash Provided by (Used in) Financing Activities, Discontinued Operations |  | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Net Cash (Used in) Provided by Financing Activities |  | 432,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember | (1,408,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = cnx_OtherGuarantorsSubsidiariesMember
Non-Guarantors |  |  |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | 36,902,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (843,456,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 21,423,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash Provided by (Used in) Operating Activities, Discontinued Operations | (33,926,000)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 105,206,000 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 270,771,000 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net Cash Provided by Operating Activities | 2,976,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (738,250,000)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 292,194,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Investing Activities: |  |  |
Capital Expenditures | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Proceeds from Sales of Assets | 13,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 112,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 254,000 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Increase (Decrease) in Restricted Cash |  | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net Investment in Equity Affiliates | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net Cash Provided by (Used in) Investing Activities, Continuing Operations | 13,000 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 112,000 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 254,000 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  | 777,145,000 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (328,789,000)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net Cash Used in Investing Activities |  | 777,257,000 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (328,535,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Financing Activities: |  |  |
Repayments of Other Debt | 2,630,000 us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 792,000 us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Payments On Long Term Notes Including Redemption Premium | 0 cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Proceeds from Issuance of Long-Term Notes | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Payments on Securitzation Facility |  | (37,846,000)us-gaap_ProceedsFromIssuanceOfSecuredDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Dividends Paid | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
(Payments on) Proceeds from Short-Term Borrowings |  | 0 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Proceeds from Issuance of Common Stock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Proceeds from Issuance of Common Stock |  | 0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Other Financing Activities | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 37,404,000 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net Cash Provided by (Used in) Financing Activities, Continuing Operations | (2,630,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (38,638,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 37,404,000 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash Provided by (Used in) Financing Activities, Discontinued Operations |  | (520,000)us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (601,000)us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net Cash (Used in) Provided by Financing Activities |  | (39,158,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 36,803,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Elimination |  |  |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | 387,663,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 332,487,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cash Provided by (Used in) Operating Activities, Discontinued Operations | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net Cash Provided by Operating Activities | 387,663,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 332,487,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Investing Activities: |  |  |
Capital Expenditures | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Proceeds from Sales of Assets | 0 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Increase (Decrease) in Restricted Cash |  | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net Investment in Equity Affiliates | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 200,000,000 us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net Cash Provided by (Used in) Investing Activities, Continuing Operations | 0 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (200,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net Cash Used in Investing Activities |  | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (200,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Financing Activities: |  |  |
Repayments of Other Debt | 387,663,000 us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_RepaymentsOfOtherDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Payments On Long Term Notes Including Redemption Premium | 0 cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Proceeds from Issuance of Long-Term Notes | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Payments on Securitzation Facility |  | 0 us-gaap_ProceedsFromIssuanceOfSecuredDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Dividends Paid | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (200,000,000)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
(Payments on) Proceeds from Short-Term Borrowings |  | (332,487,000)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Proceeds from Issuance of Common Stock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Proceeds from Issuance of Common Stock |  | 0 us-gaap_ProceedsFromContributionsFromParent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Other Financing Activities | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net Cash Provided by (Used in) Financing Activities, Continuing Operations | (387,663,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (332,487,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 200,000,000 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cash Provided by (Used in) Financing Activities, Discontinued Operations |  | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net Cash (Used in) Provided by Financing Activities |  | $ (332,487,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ 200,000,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The net cash outflow or inflow associated with the acquisition or sale of a business segment during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from parent as a source of financing that is recorded as additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash outflow for the payment of other borrowing not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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