Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 56,834	$ 27,805	$ 77,777
State	7,507	(577)	7,972
Foreign	20,650	6,327	8,002
Current income tax provision	84,991	33,555	93,751
Deferred:
Federal	(118,919)	42,964	(10,065)
State	4,413	3,445	(1,932)
Foreign	(463)	(1,398)	(1,281)
Deferred income tax (benefit) provision	(114,969)	45,011	(13,278)
(Benefit) Provision for income taxes	$ (29,978)	$ 78,566	$ 80,473