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Income Taxes - Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Current income tax expense	$ 16,022	$ 12,315	$ 30,051	$ 28,024
Deferred income tax expense (benefit)	(2,607)	379	(4,540)	(1,739)
Income tax expense, as reported	$ 13,415	$ 12,694	$ 25,511	$ 26,285
Effective tax rate	16.80%	17.50%	16.70%	18.60%

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.