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Derivative Instruments and Hedging Activities (Details) (Derivatives Designated as Hedging Instruments) | Dec. 31, 2012 MMcf
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Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 1 |
Derivative disclosures |
Collar Ceiling Price | 4.12
Collar Floor Price | 3.09
Volume | 35,500
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 2 |
Derivative disclosures |
Collar Ceiling Price | 4.01
Collar Floor Price | 3.35
Volume | 35,500
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 3 |
Derivative disclosures |
Collar Ceiling Price | 4.12
Collar Floor Price | 3.40
Volume | 17,700
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 4 |
Derivative disclosures |
Collar Ceiling Price | 4.17
Collar Floor Price | 3.60
Volume | 17,700
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 5 |
Derivative disclosures |
Collar Ceiling Price | 4.16
Collar Floor Price | 3.76
Volume | 17,700
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 6 |
Derivative disclosures |
Collar Ceiling Price | 4.34
Collar Floor Price | 3.86
Volume | 17,700
Natural Gas Collars with contract period of Jan. 2013 - Dec. 2013 Tranche 7 |
Derivative disclosures |
Collar Ceiling Price | 6.20
Collar Floor Price | 5.15
Volume | 17,700
Crude Oil Swaps with contract period of Jan. 2013 - Dec. 2013 |
Derivative disclosures |
Weighted-Average Contract Price | 101.90
Volume | 1,095

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- Definition Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in nonmonetary units. + References No definition available. + Details
Name: | cog_NonmonetaryNotionalAmountOfPriceRiskDerivatives1
Namespace Prefix: | cog_
Data Type: | num:volumeItemType
Balance Type: | na
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- Definition The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeCapPrice
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Definition Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeFloorPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
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Period Type: | instant

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

X
- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant