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Significant Accounting Policy Accumulated Other Comprehensive Income (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications, net of tax, related to discontinued operations | $ 258,250 cnx_Reclassificationsnetoftaxrelatedtodiscontinuedoperations |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | 121,521,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | 42,493,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (28,753,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | (133,889,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | (310,743,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | 10,465,000 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | 53,990,000 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | 121,484,000 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Defined Benefit Plan, Actuarial Net (Gains) Losses | 46,155,000 us-gaap_DefinedBenefitPlanActuarialGainLoss | 86,481,000 us-gaap_DefinedBenefitPlanActuarialGainLoss | 106,299,000 us-gaap_DefinedBenefitPlanActuarialGainLoss
Curtailment Gain/Loss - Deferred Tax | (36,182,000)cnx_CurtailmentGainLossDeferredTax | 0 cnx_CurtailmentGainLossDeferredTax | 0 cnx_CurtailmentGainLossDeferredTax
Net periodic (benefit) cost | 16,687,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | 93,799,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | 52,446,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Actuarially Determined Long-Term Liability Tax Expense | (6,139,000)cnx_ActuariallyDeterminedLongTermLiabilityTaxExpense | (35,806,000)cnx_ActuariallyDeterminedLongTermLiabilityTaxExpense | (19,720,000)cnx_ActuariallyDeterminedLongTermLiabilityTaxExpense
Defined Benefit Plan, Service Cost | (22,381,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit | (32,164,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit | (53,853,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Actuarially Long-Term Liabilities Net of Tax | 10,548,000 cnx_ActuariallyLongTermLiabilitiesNetofTax | 57,993,000 cnx_ActuariallyLongTermLiabilitiesNetofTax | 32,726,000 cnx_ActuariallyLongTermLiabilitiesNetofTax
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax | (272,621,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax | (367,610,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (151,100,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (325,117,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 181,757,000 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (7,740,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |  |
Other Comprehensive Income (Loss), Net of Tax | 174,017,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 422,225,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 54,212,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Commodity Contract [Member] | Cash Flow Hedging [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion | (18,288,000)us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | (79,899,000)us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | (189,259,000)us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Pension Plan, Defined Benefit [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Defined Benefit Plan, Actuarial Net (Gains) Losses | 136,995,000 us-gaap_DefinedBenefitPlanActuarialGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | (82,718,000)us-gaap_DefinedBenefitPlanActuarialGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Defined Benefit Plan, Net Periodic Benefit Cost | 29,095,000 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | (39,482,000)us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 0 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Net periodic (benefit) cost | 52,406,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 81,230,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 58,099,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Defined Benefit Plan, Service Cost | (1,217,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | (1,611,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | (1,630,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax | 331,500,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | 282,008,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Postretirement Benefit Costs [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 84,441,000 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PostretirementBenefitCostsMember |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 10,548,000 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PostretirementBenefitCostsMember |  |
Other Comprehensive Income (Loss), Net of Tax | 94,989,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_PostretirementBenefitCostsMember |  |
Cash Flow Hedging [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 97,316,000 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_CashFlowHedgingMember |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (18,288,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_CashFlowHedgingMember |  |
Other Comprehensive Income (Loss), Net of Tax | $ 79,028,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_CashFlowHedgingMember |  |

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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