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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013 item
Drilling Rig Commitments |
COMMITMENTS AND CONTINGENCIES |
Number of drilling rig commitments | 2
Drilling Rig Commitments |
2013 | $ 3.4
2014 | 14.9
2015 | 6.8
2016 | 4.4
Drilling Rig Commitments One |
COMMITMENTS AND CONTINGENCIES |
Drilling rig commitment term | 2 years
Drilling Rig Commitments Two |
COMMITMENTS AND CONTINGENCIES |
Drilling rig commitment term | 3 years
Transportation Agreements |
COMMITMENTS AND CONTINGENCIES |
Amount of increase in the future aggregate obligations under the transportation commitments | $ 49.4

X
- Definition Represents the term of the drilling rig commitment of the entity. + References No definition available. + Details
Name: | cog_DrillingRigCommitmentTerm
Namespace Prefix: | cog_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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 Represents the number of drilling rig commitments entered into by the entity. + References No definition available. + Details
Name: | cog_NumberOfDrillingRigCommitments
Namespace Prefix: | cog_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contractual obligation maturing in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contractual obligation maturing in the remainder of the fiscal year following the latest fiscal year ended. + References No definition available. + Details
Name: | us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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