Derivative Financial Instruments and Hedging Activities - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014 Derivatives	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments And Hedging Activities [Line Items]
Outstanding commodity derivatives	0
Gain on derivative financial instruments	$ 8,200,000us-gaap_DerivativeGainOnDerivative		$ 21,300,000us-gaap_DerivativeGainOnDerivative
Loss on derivative financial instruments		8,400,000us-gaap_DerivativeLossOnDerivative
Cash settlements of derivative financial instruments	9,145,000us-gaap_DerivativeCashReceivedOnHedge	2,293,000us-gaap_DerivativeCashReceivedOnHedge	9,766,000us-gaap_DerivativeCashReceivedOnHedge
Derivative asset at fair value		1,000,000
Derivative asset at carrying value		1,000,000crk_DerivativeAssetsCarryValueNet
Derivative asset current at carrying value		$ 1,000,000us-gaap_DerivativeAssetsCurrent
Contract terms 2014 oil production
Derivative Instruments And Hedging Activities [Line Items]
Quantity of Crude Oil for Which Swap Entered	2,438,000	2,160,000	1,710,000
NYMEX price of crude oil swaps	96.56	98.67	99.46

Derivative assets carry value net.

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Derivative swaps NYMEX price.

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Quantity of crude oil for which swap entered.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The amount of cash received during the period on settlement of a hedge.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Amount of increase in the fair value of derivatives recognized in the income statement.

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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The number of derivative instruments of a particular group held by the entity.

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