Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current expense:
Federal	$ 42,459	$ 71,002	$ 50,304
State	567	7,741	7,196
Foreign	7,124	3,752	4,052
Total current income tax expense	50,150	82,495	61,552
Deferred (benefit) expense:
Federal	(35,353)	(33,398)	(13,134)
State	(1,409)	2,710	(2,369)
Foreign	209	918	(661)
Total deferred income tax expense	(36,553)	(29,770)	(16,164)
Total income tax expense (benefit)	$ 13,597	$ 52,725	$ 45,388