Income Taxes - Components of Income Taxes (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 taxes, Federal	$ 39,168	$ 72,909	$ 62,886
Current income taxes, State	8,208	7,369	4,551
Current income taxes, Foreign	55,144	46,026	29,551
Total current	102,520	126,304	96,988
Deferred income taxes, Federal	41,814	(1,287)	2,295
Deferred income taxes, State	(596)	130	417
Deferred income taxes, Foreign	498	(6,079)	(5,109)
Total deferred	41,716	(7,236)	(2,397)
Provision for income taxes, amount	$ 144,236	$ 119,068	$ 94,591