Components of Provision for (Benefit from) Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Federal	$ 22,239	$ 84,743	$ 28,093
State and local	1,418	5,323	3,011
Foreign	3,557	3,836	3,614
Current income tax expense, total	27,214	93,902	34,718
Federal	(78,428)	(17,741)	(20,367)
State and local	(6,012)	(8,770)	(4,982)
Foreign	(143,614)	(50,316)	(268)
Deferred income tax expense (benefit), total	(228,054)	(76,827)	(25,617)
Provision for (benefit from) income taxes	$ (200,840)	$ 17,075	$ 9,101