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Commitments and Contingencies (Details) (Transportation and Gathering Agreements, USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014
Transportation and Gathering Agreements |
Commitments and Contingencies |
Amount of increase in the future aggregate obligations under the transportation commitments | $ 230.5
Period over which increase in transportation and gathering agreements obligation is affected | 13 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