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Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components Of Income Tax Expense Benefit [Line Items]
U.S. Federal	$ 74,561us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	$ 62,616us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	$ 50,919us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State	10,325us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	9,234us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	6,245us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Foreign	6,953us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations	5,810us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations	5,478us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Income tax expense	91,839us-gaap_IncomeTaxExpenseBenefit	77,660us-gaap_IncomeTaxExpenseBenefit	62,642us-gaap_IncomeTaxExpenseBenefit
Current	91,550us-gaap_CurrentIncomeTaxExpenseBenefit	69,071us-gaap_CurrentIncomeTaxExpenseBenefit	55,918us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	289us-gaap_DeferredIncomeTaxExpenseBenefit	8,589us-gaap_DeferredIncomeTaxExpenseBenefit	6,724us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense	$ 91,839us-gaap_IncomeTaxExpenseBenefit	$ 77,660us-gaap_IncomeTaxExpenseBenefit	$ 62,642us-gaap_IncomeTaxExpenseBenefit

X

- Definition

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

+ References

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations.

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Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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