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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 Drilling Rig Commitments item | Jun. 30, 2013 Drilling Rig Commitments One | Jun. 30, 2013 Drilling Rig Commitments Two | Jun. 30, 2013 Transportation Agreements
COMMITMENTS AND CONTINGENCIES |  |  |  |
Amount of increase in the future aggregate obligations under the transportation agreements |  |  |  | $ 25.3
Number of drilling rig commitments | 2 |  |  |
Drilling rig commitment term |  | 2 years | 3 years |
Drilling Rig Commitments |  |  |  |
2013 | 7.0 |  |  |
2014 | 14.9 |  |  |
2015 | 6.8 |  |  |
2016 | $ 4.4 |  |  |

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
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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
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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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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