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Properties and Equipment, Net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 8,291,686us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod $ 7,984,979us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Unproved oil and gas properties 486,562us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod 492,208us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Gathering and pipeline systems 241,458cog_GatheringAndPipelineSystems 241,272cog_GatheringAndPipelineSystems
Land, building and other equipment 111,090cog_LandBuildingAndOtherEquipment 109,758cog_LandBuildingAndOtherEquipment
Properties and equipment, gross, total 9,130,796us-gaap_PropertyPlantAndEquipmentGross 8,828,217us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation, depletion and amortization (4,071,992)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (3,902,506)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Properties and equipment, net $ 5,058,804us-gaap_PropertyPlantAndEquipmentNet $ 4,925,711us-gaap_PropertyPlantAndEquipmentNet