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Oil and Gas Reserves Information (Unaudited) - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012 MMcf	Dec. 31, 2014	Dec. 31, 2013
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Annual Change in Total Proved Undeveloped Natural Gas Reserves	(460,000)crk_ProvedUndevelopedReservesRevisionsIncreaseDecrease
Crude Oil and NGL Per Barrel
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Average sales prices		92.55us-gaap_AverageSalesPrices / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember	104.38us-gaap_AverageSalesPrices / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember
Natural Gas Per Thousand Cubic Feet
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Average sales prices		3.96us-gaap_AverageSalesPrices / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember	3.37us-gaap_AverageSalesPrices / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasPerThousandCubicFeetMember

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- Definition

Proved undeveloped reserves revisions increase decrease.

+ References

No definition available.

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- Definition

The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 3

-Subparagraph A

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