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Components of Income Tax Provision (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Federal income tax expense (benefit):      
Current $ 39,438us-gaap_CurrentFederalTaxExpenseBenefit $ 41,558us-gaap_CurrentFederalTaxExpenseBenefit $ (512)us-gaap_CurrentFederalTaxExpenseBenefit
Deferred 39,673us-gaap_DeferredFederalIncomeTaxExpenseBenefit 47,136us-gaap_DeferredFederalIncomeTaxExpenseBenefit 156,003us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal Income Tax Expense (Benefit), Continuing Operations, Total 79,111us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 88,694us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 155,491us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State income tax expense:      
Current 3,987us-gaap_CurrentStateAndLocalTaxExpenseBenefit 11,733us-gaap_CurrentStateAndLocalTaxExpenseBenefit 12,455us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred 5,292us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 4,229us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 5,483us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State and Local Income Tax Expense (Benefit), Continuing Operations, Total 9,279us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 15,962us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 17,938us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Foreign income tax expense (benefit):      
Current 4,521us-gaap_CurrentForeignTaxExpenseBenefit 4,572us-gaap_CurrentForeignTaxExpenseBenefit 3,817us-gaap_CurrentForeignTaxExpenseBenefit
Deferred (1,292)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (796)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (1,050)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Foreign Income Tax Expense (Benefit), Continuing Operations, Total 3,229us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 3,776us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 2,767us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Total income tax expense:      
Current 47,946us-gaap_CurrentIncomeTaxExpenseBenefit 57,863us-gaap_CurrentIncomeTaxExpenseBenefit 15,760us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred 43,673us-gaap_DeferredIncomeTaxExpenseBenefit 50,569us-gaap_DeferredIncomeTaxExpenseBenefit 160,436us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense $ 91,619us-gaap_IncomeTaxExpenseBenefit $ 108,432us-gaap_IncomeTaxExpenseBenefit $ 176,196us-gaap_IncomeTaxExpenseBenefit