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Components of Income Tax Expense Included in Consolidated Statements of Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income tax expense:      
Federal $ 126,203us-gaap_CurrentFederalTaxExpenseBenefit $ 74,327us-gaap_CurrentFederalTaxExpenseBenefit $ 102,953us-gaap_CurrentFederalTaxExpenseBenefit
State 5,161us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,949us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,572us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 7,694us-gaap_CurrentForeignTaxExpenseBenefit 6,822us-gaap_CurrentForeignTaxExpenseBenefit 8,450us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax expense 139,058us-gaap_CurrentIncomeTaxExpenseBenefit 84,098us-gaap_CurrentIncomeTaxExpenseBenefit 113,975us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit):      
Federal (3,623)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 27,447us-gaap_DeferredFederalIncomeTaxExpenseBenefit 1,395us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State (2,039)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (55)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 411us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign (3,635)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (509)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (1,665)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred income tax expense (9,297)us-gaap_DeferredIncomeTaxExpenseBenefit 26,883us-gaap_DeferredIncomeTaxExpenseBenefit 141us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense $ 129,761us-gaap_IncomeTaxExpenseBenefit $ 110,981us-gaap_IncomeTaxExpenseBenefit $ 114,116us-gaap_IncomeTaxExpenseBenefit