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Properties and Equipment, Net (Details 2) | 6 Months Ended
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Jun. 30, 2015
Property, Plant and Equipment [Abstract] |
Minimum term of capitalization of exploratory well costs | 1 year

X
- Definition Represents the term of capitalization used for aging disclosure. + References No definition available. + Details
Name: | cog_CapitalizedExploratoryWellPeriodofCapitalization
Namespace Prefix: | cog_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration