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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details) (Derivatives Designated as Hedging Instruments) | Sep. 30, 2013 MMcf
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Natural Gas Collars with contract period of Oct. 2013 - Dec. 2013 Tranche 1 |
Derivative disclosures |
Volume | 4,500
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2013 Tranche 1 | Minimum |
Derivative disclosures |
Collar Ceiling Price | 6.18
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2013 Tranche 1 | Maximum |
Derivative disclosures |
Collar Ceiling Price | 6.23
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2013 Tranche 1 | Weighted Average |
Derivative disclosures |
Collar Floor Price | 5.15
Collar Ceiling Price | 6.20
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2013 Tranche 2 |
Derivative disclosures |
Volume | 54,500
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2013 Tranche 2 | Minimum |
Derivative disclosures |
Collar Floor Price | 3.09
Collar Ceiling Price | 3.98
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2013 Tranche 2 | Maximum |
Derivative disclosures |
Collar Floor Price | 4.37
Collar Ceiling Price | 5.02
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2013 Tranche 2 | Weighted Average |
Derivative disclosures |
Collar Floor Price | 3.63
Collar Ceiling Price | 4.27
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2014 Tranche 3 |
Derivative disclosures |
Volume | 44,400
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2014 Tranche 3 | Minimum |
Derivative disclosures |
Collar Floor Price | 3.60
Collar Ceiling Price | 4.55
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2014 Tranche 3 | Maximum |
Derivative disclosures |
Collar Floor Price | 3.96
Collar Ceiling Price | 4.59
Natural Gas Collars with contract period of Oct. 2013 - Dec. 2014 Tranche 3 | Weighted Average |
Derivative disclosures |
Collar Floor Price | 3.78
Collar Ceiling Price | 4.57
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 4 |
Derivative disclosures |
Volume | 124,100
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 4 | Minimum |
Derivative disclosures |
Collar Floor Price | 3.86
Collar Ceiling Price | 4.63
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 4 | Maximum |
Derivative disclosures |
Collar Floor Price | 4.37
Collar Ceiling Price | 4.80
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 4 | Weighted Average |
Derivative disclosures |
Collar Floor Price | 4.19
Collar Ceiling Price | 4.70
Crude Oil Swaps with contract period of Oct. 2013 - Dec. 2013 Tranche 1 |
Derivative disclosures |
Volume | 276
Swaps Weighted Average | 101.90

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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
Period Type: | instant

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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_
Data Type: | us-types:perUnitItemType
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
Balance Type: | na
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

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- 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