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Derivative Instruments and Hedging Activities (Details 4) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Derivative instruments and hedging activities    
Ineffectiveness related to derivative instruments   $ 0us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion) 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax (70,775,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Unrealized gain (loss) on derivative instruments (3,562,000)us-gaap_UnrealizedGainLossOnDerivatives 0us-gaap_UnrealizedGainLossOnDerivatives
Gain (loss) on derivative instruments 34,123,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet 0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Total 34,123,000us-gaap_DerivativeGainLossOnDerivativeNet (70,775,000)us-gaap_DerivativeGainLossOnDerivativeNet
Natural Gas Revenues    
Derivative instruments and hedging activities    
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion) 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_IncomeStatementLocationAxis
= cog_NaturalGasRevenuesMember
(70,557,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_IncomeStatementLocationAxis
= cog_NaturalGasRevenuesMember
Crude Oil and Condensate Revenues    
Derivative instruments and hedging activities    
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion) 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_IncomeStatementLocationAxis
= cog_CrudeOilAndCondensateRevenuesMember
(218,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_IncomeStatementLocationAxis
= cog_CrudeOilAndCondensateRevenuesMember
Commodity contracts    
Derivative instruments and hedging activities    
Amount of gain (loss) recognized in other comprehensive income (loss) on derivative (effective portion) 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
(133,310,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Derivatives Designated as Hedges    
Derivative instruments and hedging activities    
Realized gain (loss) on derivative instruments 0cog_RealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
(70,775,000)cog_RealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Derivatives Designated as Hedges | Natural Gas Revenues    
Derivative instruments and hedging activities    
Realized gain (loss) on derivative instruments 0cog_RealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= cog_NaturalGasRevenuesMember
(70,557,000)cog_RealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= cog_NaturalGasRevenuesMember
Derivatives Designated as Hedges | Crude Oil and Condensate Revenues    
Derivative instruments and hedging activities    
Realized gain (loss) on derivative instruments 0cog_RealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= cog_CrudeOilAndCondensateRevenuesMember
(218,000)cog_RealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= cog_CrudeOilAndCondensateRevenuesMember
Derivatives Not Designated as Hedges    
Derivative instruments and hedging activities    
Unrealized gain (loss) on derivative instruments (3,562,000)us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
0us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivatives Not Designated as Hedges | Gain (loss) on derivative instruments    
Derivative instruments and hedging activities    
Realized gain (loss) on derivative instruments $ 37,685,000cog_RealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GainLossOnDerivativeInstrumentsMember
$ 0cog_RealizedGainLossOnDerivatives
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GainLossOnDerivativeInstrumentsMember