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Summary of Significant Accounting Policies - Additional Information 3 (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operations And Summary Of Significant Accounting Policies [Line Items]                
Conversion ratio of oil to natural gas in units of production           One barrel of oil for six thousand cubic feet of natural gas    
Impairment of unproved oil and natural gas properties $ 487,000crk_ImpairmentChargesRelatedToUnevaluatedProperties $ 18,081,000crk_ImpairmentChargesRelatedToUnevaluatedProperties $ 2,995,000crk_ImpairmentChargesRelatedToUnevaluatedProperties $ 9,465,000crk_ImpairmentChargesRelatedToUnevaluatedProperties $ 2,443,000crk_ImpairmentChargesRelatedToUnevaluatedProperties $ 487,000crk_ImpairmentChargesRelatedToUnevaluatedProperties $ 32,984,000crk_ImpairmentChargesRelatedToUnevaluatedProperties $ 61,300,000crk_ImpairmentChargesRelatedToUnevaluatedProperties
Impairment charges related to oil and gas properties           60,300,000crk_ImpairmentChargesRelatedToOilAndGasProperties 700,000crk_ImpairmentChargesRelatedToOilAndGasProperties 25,400,000crk_ImpairmentChargesRelatedToOilAndGasProperties
Impaired oil and gas properties fair value           $ 18,000,000crk_ImpairedOilAndGasPropertiesFairValue    
Minimum                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Property and equipment estimated useful lives           3 years    
Maximum                
Operations And Summary Of Significant Accounting Policies [Line Items]                
Property and equipment estimated useful lives           31 years 6 months