Income Taxes - Summary of Tax Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current Federal	$ 94,036	$ 87,189	$ 86,406
Current State	3,636	4,751	7,887
Current Foreign	10,589	812	24,331
Current Income Tax Expense (Benefit), Total	108,261	92,752	118,624
Deferred Federal	33,446	15,594	8,937
Deferred State	3,413	(304)	9,774
Deferred Foreign	(1,225)	8,303	(13,691)
Deferred Income Tax Expense (Benefit), Total	35,634	23,593	5,020
Income tax	$ 143,895	$ 116,345	$ 123,644