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Stock-Based Compensation--Stock-Based Compensation Cost (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation cost $ 6,235cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalCompensationCost $ 7,819cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalCompensationCost $ 4,982cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalCompensationCost
Less: stock-based compensation cost capitalized (2,346)us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount (2,345)us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount (1,917)us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Stock-based compensation expense 3,889us-gaap_AllocatedShareBasedCompensationExpense 5,474us-gaap_AllocatedShareBasedCompensationExpense 3,065us-gaap_AllocatedShareBasedCompensationExpense
Recognized tax benefit associated with stock-based compensation 1,452us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 2,031us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 1,230us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Payments for share based compensation (2,995)us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards (1,533)us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards (1,386)us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards
Stock-based compensation costs included in accrued payroll and benefits payable 4,830us-gaap_DeferredCompensationLiabilityCurrent 5,081us-gaap_DeferredCompensationLiabilityCurrent  
Unrecognized stock-based compensation cost $ 15,227us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions    
Unrecognized compensation recognition period 2 years 6 months 1 day