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Income Taxes (Income Tax Expense) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current income tax expense	$ 62,177us-gaap_CurrentIncomeTaxExpenseBenefit	$ 49,736us-gaap_CurrentIncomeTaxExpenseBenefit	$ 76,928us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit)	(4,130)us-gaap_DeferredIncomeTaxExpenseBenefit	3,279us-gaap_DeferredIncomeTaxExpenseBenefit	(6,405)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense, as reported	$ 58,047us-gaap_IncomeTaxExpenseBenefit	$ 53,015us-gaap_IncomeTaxExpenseBenefit	$ 70,523us-gaap_IncomeTaxExpenseBenefit

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

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