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Income Taxes - Tax Effects of Significant Temporary Differences Representing Net Deferred Tax Asset and Liability (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current deferred tax liabilities:    
Derivative financial instruments   $ (339)crk_DeferredTaxLiabilitiesDerivativesCurrent
Net current deferred tax liability   (339)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Noncurrent deferred tax assets (liabilities):    
Property and equipment (259,222)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (238,361)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other assets 7,854us-gaap_DeferredTaxAssetsOther 8,221us-gaap_DeferredTaxAssetsOther
Net operating loss carryforwards 126,026us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 70,207us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Alternative minimum tax carryforward 20,435us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 21,178us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Valuation allowance on net operating loss carryforwards (46,639)us-gaap_OperatingLossCarryforwardsValuationAllowance (35,507)us-gaap_OperatingLossCarryforwardsValuationAllowance
Other (3,001)us-gaap_DeferredTaxLiabilitiesOther (2,764)us-gaap_DeferredTaxLiabilitiesOther
Net noncurrent deferred tax liability (154,547)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent (177,026)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Net deferred tax liability $ (154,547)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (177,365)us-gaap_DeferredTaxAssetsLiabilitiesNet