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Summary of Significant Accounting Policies - Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accrued Liabilities, Current [Abstract]    
Accrued oil and gas property acquisition costs   $ 40,128crk_AccruedOilAndGasPropertyAcquisitionCosts
Accrued drilling costs 26,269crk_AccruedDrillingCosts 34,914crk_AccruedDrillingCosts
Accrued interest payable 9,011us-gaap_InterestPayableCurrent 7,051us-gaap_InterestPayableCurrent
Accrued rig termination fees 2,600crk_AccruedRigTerminationFees  
Other 6,962us-gaap_OtherAccruedLiabilitiesCurrent 9,204us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses $ 44,842us-gaap_AccruedLiabilitiesCurrent $ 91,297us-gaap_AccruedLiabilitiesCurrent