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Oil and Gas Reserves Information (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Extractive Industries [Abstract]
Standardized Measure, Beginning of Year	$ 807,217us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	$ 641,325us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	$ 887,798us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
Net change in sales price, net of production costs	5,911us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	43,117us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	(217,925)us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts
Development costs incurred during the year which were previously estimated	344,590us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	187,643us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	179,549us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod
Revisions of quantity estimates	(40,993)us-gaap_RevisionsOfPreviousQuantityEstimates	48,411us-gaap_RevisionsOfPreviousQuantityEstimates	(886,531)us-gaap_RevisionsOfPreviousQuantityEstimates
Accretion of discount	105,400us-gaap_AccretionOfDiscount	81,434us-gaap_AccretionOfDiscount	117,381us-gaap_AccretionOfDiscount
Changes in future development and abandonment costs	(10,909)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts	(157,207)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts	628,088us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts
Changes in timing and other	(19,028)crk_ChangesInTiming	80,348crk_ChangesInTiming	27,077crk_ChangesInTiming
Extensions and discoveries	163,559us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	291,582us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	337,223us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts
Sales of minerals in place	0us-gaap_DecreaseDueToSalesOfMineralsInPlace	0us-gaap_DecreaseDueToSalesOfMineralsInPlace	(236,925)us-gaap_DecreaseDueToSalesOfMineralsInPlace
Sales, net of production costs	(458,254)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	(335,677)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	(307,407)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts
Net changes in income taxes	193,167us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	(73,759)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	112,997us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves
Standardized Measure, End of Year	$ 1,090,660us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	$ 807,217us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	$ 641,325us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

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