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Income Taxes - Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Current income tax expense	$ 19,791	$ 9,959	$ 49,842	$ 37,983
Deferred income tax expense (benefit)	(2,784)	2,010	(7,324)	271
Income tax expense, as reported	$ 17,007	$ 11,969	$ 42,518	$ 38,254
Effective tax rate	18.00%	16.50%	17.20%	17.90%

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.