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Derivative Instruments and Hedging Activities (Details) (Derivatives Designated as Hedging Instruments)	Mar. 31, 2014 MMcf
Natural Gas Collars with contract period of Apr. 2014 - Dec. 2014
Derivative disclosures
Volume	253,800
Natural Gas Collars with contract period of Apr. 2014 - Dec. 2014 | Minimum
Derivative disclosures
Collar Floor Price	3.60
Collar Ceiling Price	4.22
Natural Gas Collars with contract period of Apr. 2014 - Dec. 2014 | Maximum
Derivative disclosures
Collar Floor Price	4.37
Collar Ceiling Price	4.80
Natural Gas Collars with contract period of Apr. 2014 - Dec. 2014 | Weighted Average
Derivative disclosures
Collar Floor Price	4.13
Collar Ceiling Price	4.51
Natural Gas Swaps with contract period of Apr. 2014 - Dec. 2014 | Weighted Average
Derivative disclosures
Volume	80,100
Swaps Weighted Average	4.05
Crude Oil Swaps with contract period of Apr. 2014 - Dec. 2014 | Weighted Average
Derivative disclosures
Volume	550.0
Swaps Weighted Average	97.00

X

- 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

X

- 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

X

- 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

X

- 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