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Derivative Instruments and Hedging Activities 5 (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on derivative instruments | $ 137,603,000 us-gaap_UnrealizedGainLossOnDerivatives |  | $ 0 us-gaap_UnrealizedGainLossOnDerivatives |  | $ (494,000)us-gaap_UnrealizedGainLossOnDerivatives |
Gain (loss) in derivative instruments not designated as hedges | 145,891,000 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet |  | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet |  | (494,000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet |
Gain (loss) on derivative, net | 75,116,000 us-gaap_DerivativeGainLossOnDerivativeNet |  | 57,002,000 us-gaap_DerivativeGainLossOnDerivativeNet |  | 235,832,000 us-gaap_DerivativeGainLossOnDerivativeNet |
Derivative Instruments, Additional Disclosures |  |  |  |  |  |
Ineffectiveness related to derivative instruments | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet |  | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet |  | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet |
Derivatives Designated as Hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Realized gain (loss) on derivative instruments | (70,775,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 57,002,000 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 236,326,000 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Derivatives Not Designated as Hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on derivative instruments | 137,603,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 0 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | (494,000)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Natural gas | Derivatives Designated as Hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Realized gain (loss) on derivative instruments | (70,557,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember |  | 52,733,000 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember |  | 225,108,000 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember |
Natural gas | Derivatives Not Designated as Hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Realized gain (loss) on derivative instruments | (73,020,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember | [1] | 0 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember | [1] | 0 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember | [1]
Crude oil and condensate | Derivatives Designated as Hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Realized gain (loss) on derivative instruments | (218,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember |  | 4,269,000 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember |  | 11,218,000 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember |
Crude oil and condensate | Derivatives Not Designated as Hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Realized gain (loss) on derivative instruments | (408,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember | [1] | 0 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember | [1] | 0 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember | [1]
Gain (loss) on derivative instruments | Derivatives Not Designated as Hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Realized gain (loss) on derivative instruments | $ 81,716,000 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnDerivativeInstrumentsMember |  | $ 0 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnDerivativeInstrumentsMember |  | $ 0 cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnDerivativeInstrumentsMember |
[1] | Relates entirely to the reclassification from accumulated other comprehensive income (loss) of previously frozen losses associated with derivatives that were de-designated as cash flow hedges on April 1, 2014.

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- Definition The realized gain (loss) on derivative instruments from the difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for 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 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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