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Commitments and Contingencies (Details) (Transportation and Gathering Agreements, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Transportation and Gathering Agreements
Commitments and Contingencies
Amount of increase in the future aggregate obligations under the transportation commitments	$ 180.3
Period over which increase in transportation and gathering agreements obligation is affected	10 years

X

- Definition

Represents the increase (decrease) in aggregate future obligations for the transportation agreements during the period.

+ References

No definition available.

+ Details

Name:	cog_IncreaseDecreaseInAggregateFutureTransportationAgreementObligation
Namespace Prefix:	cog_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The period affected by the increase or (decrease) in aggregate future transportation agreement obligations.

+ References

No definition available.

+ Details

Name:	cog_PeriodOverWhichIncreaseDecreaseInAggregateFutureTransportationAgreementObligationIsAffected
Namespace Prefix:	cog_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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