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Income Taxes - Carryforwards Available to Reduce Future Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Carryforward Available To Reduce Future Income Taxes [Line Items]    
Alternative minimum tax credits carryforward $ 20,435us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax $ 21,178us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
U.S. Federal    
Carryforward Available To Reduce Future Income Taxes [Line Items]    
Net operating loss, Years of Expiration Carryforward 2017 – 2033  
Net operating loss, Tax Credit Carryforward, Amount 212,769us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		  
Years of Expiration Carryforward Unlimited    
Carryforward Available To Reduce Future Income Taxes [Line Items]    
Alternative minimum tax credits carryforward 20,435us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
/ us-gaap_IncomeTaxAuthorityAxis
= crk_YearsOfExpirationCarryforwardUnlimitedMember		  
Louisiana Tax Authority | State and Local Jurisdiction    
Carryforward Available To Reduce Future Income Taxes [Line Items]    
Net operating loss, Years of Expiration Carryforward 2015 – 2028  
Net operating loss, Tax Credit Carryforward, Amount $ 991,483us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= crk_LouisianaTaxAuthorityMember