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Acquisitions and Divestitures (Details) (USD $) | 12 Months Ended | 1 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2014 | Oct. 31, 2014
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Gain (loss) on sale of assets | $ 17,120,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | $ 21,351,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | $ 50,635,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment |  |  |  |  |
Proceeds from sale of assets | 39,491,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 323,501,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 169,326,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  |  |  |  |
Oklahoma and Texas panhandles oil and gas properties |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | 19,400,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_OklahomaAndTexasPanhandlesPropertiesMember |  |  |  |
Proceeds from sale of oil and gas properties before closing adjustments |  |  |  | 160,000,000 cog_SaleOfPropertyProceedsBeforeClosingAdjustment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_OklahomaAndTexasPanhandlesPropertiesMember |  |  |  |
Oklahoma, Texas and Kansas |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | (17,500,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_OklahomaTexasAndKansasPropertiesMember |  |  |  |
Proceeds from sale of oil and gas properties before closing adjustments |  |  |  | 123,400,000 cog_SaleOfPropertyProceedsBeforeClosingAdjustment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_OklahomaTexasAndKansasPropertiesMember |  |  |  |
Other properties |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  | 19,500,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_OtherPropertiesMember | 1,800,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_OtherPropertiesMember |  |  |  |  |
Proceeds from sale of assets |  |  | 14,400,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_OtherPropertiesMember |  |  |  |  |
Proceeds from sale of oil and gas properties |  | 44,300,000 us-gaap_ProceedsFromSaleOfProductiveAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_OtherPropertiesMember |  |  |  |  |  |
Texas oil and gas properties |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  | (18,200,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_TexasPropertiesMember |  |  |
Proceeds from sale of oil and gas properties before closing adjustments |  |  |  |  | 29,900,000 cog_SaleOfPropertyProceedsBeforeClosingAdjustment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_TexasPropertiesMember |  |  |
Pearsall shale |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  | 67,000,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_PearsallShaleMember |  |
Proceeds from sale of oil and gas properties |  |  |  |  |  | 125,000,000 us-gaap_ProceedsFromSaleOfProductiveAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_PearsallShaleMember |  |
Non-operated working interest (as a percent) |  |  |  |  |  | 35.00%cog_NonOperatedWorkingInterest / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_PearsallShaleMember |  |
Total consideration received from the sale of properties |  |  |  |  |  | 250,000,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_PearsallShaleMember |  |
Percentage of fund for the Company's share of future drilling and completion costs |  |  |  |  |  | 85.00%cog_ReimbursementPercentageOfCompletionAndDrillingCosts / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_PearsallShaleMember |  |
Future drilling and completion costs to be funded by third party |  |  |  |  |  | 125,000,000 cog_FutureDrillingAndCompletionCostsToBeFundedByThirdParty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cog_PearsallShaleMember |  |
Oil and Gas Properties, Proved and Unproved | Eagle Ford Shale in South Texas |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Acquisition cost of proved and unproved oil and gas properties |  |  |  |  |  |  | 30,500,000 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cog_OilandGasPropertiesProvedandUnprovedMember / us-gaap_StatementGeographicalAxis = cog_EagleFordShaleinSouthTexasMember | 210,000,000 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cog_OilandGasPropertiesProvedandUnprovedMember / us-gaap_StatementGeographicalAxis = cog_EagleFordShaleinSouthTexasMember
Total cash consideration paid for proved and unproved oil and gas properties as of closing date |  |  |  |  |  |  | 29,600,000 cog_CostsIncurredAcquisitionofOilandGasPropertiesTotalCashConsiderationPaid / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cog_OilandGasPropertiesProvedandUnprovedMember / us-gaap_StatementGeographicalAxis = cog_EagleFordShaleinSouthTexasMember | 185,200,000 cog_CostsIncurredAcquisitionofOilandGasPropertiesTotalCashConsiderationPaid / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cog_OilandGasPropertiesProvedandUnprovedMember / us-gaap_StatementGeographicalAxis = cog_EagleFordShaleinSouthTexasMember
Adjustment to acquisition cost, consents for leaseholds |  |  |  |  |  |  |  | 17,400,000 cog_CostsIncurredAcquisitionOfOilAndGasPropertiesPurchasePriceAdjustmentLeaseholdConsents / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cog_OilandGasPropertiesProvedandUnprovedMember / us-gaap_StatementGeographicalAxis = cog_EagleFordShaleinSouthTexasMember
Adjustment to acquisition cost, customary purchase price adjustment |  |  |  |  |  |  |  | 8,000,000 cog_CostsIncurredAcquisitionOfOilAndGasPropertiesPurchasePriceAdjustment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cog_OilandGasPropertiesProvedandUnprovedMember / us-gaap_StatementGeographicalAxis = cog_EagleFordShaleinSouthTexasMember
Acquisition, assumed liability related to asset retirement obligations |  |  |  |  |  |  |  | 1,200,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cog_OilandGasPropertiesProvedandUnprovedMember / us-gaap_StatementGeographicalAxis = cog_EagleFordShaleinSouthTexasMember
Oil and Gas Properties, Proved and Unproved | East Texas |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  | 19,900,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cog_OilandGasPropertiesProvedandUnprovedMember / us-gaap_StatementGeographicalAxis = cog_EastTexasMember
Proceeds from sale of assets |  |  |  |  |  |  |  | $ 44,300,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cog_OilandGasPropertiesProvedandUnprovedMember / us-gaap_StatementGeographicalAxis = cog_EastTexasMember

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