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Stock-based Compensation - Summary of PSU Activity (Detail) (Performance Share Units (PSU))
 12 Months Ended
Dec. 31, 2014
Unit
Dec. 31, 2012
Performance Share Units (PSU)
    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning Balance, Number of Units, Outstanding 254,918crk_NumberOfPerformanceShareUnitsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		  
Number of Units, Awards granted and adjustments for dividend paid 203,783crk_NumberOfPerformanceShareUnitsAwardsGrantedAndAdjustmentsForDividendPaid
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		  
Number of Units, Earned and issued (85,629)crk_NumberOfPerformanceShareUnitsEarnedAndIssued
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		  
Ending Balance, Number of Units, Outstanding 373,072crk_NumberOfPerformanceShareUnitsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		  
Beginning Balance, Weighted Average Grant Price, Outstanding 20.92crk_PerformanceShareUnitsOutstandingWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		  
Weighted Average Grant Price, Awards granted and adjustments for dividend paid 19.81crk_GrantDateFairValueOfPerformanceShareUnits
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 21.14crk_GrantDateFairValueOfPerformanceShareUnits
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Weighted Average Grant Price, earned and issued 19.37crk_PerformanceShareUnitsEarnedAndIssuedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		  
Ending Balance, Weighted Average Grant Price, Outstanding 19.88crk_PerformanceShareUnitsOutstandingWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember