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Properties and Equipment, Net (Details 2)	3 Months Ended
	Mar. 31, 2014
Properties and Equipment, Net
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_CapitalizedExploratoryWellCostsPeriodOfCapitalization
Namespace Prefix:	cog_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration