Income Taxes - Components of Tax Benefit (Expenses) for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 9,346	$ (16,365)	$ (85,352)
State and local	(849)	(2,147)	(3,984)
Foreign	(109,032)	(62,278)	(27,090)
Subtotal	(100,535)	(80,790)	(116,426)
Deferred:
Federal	9,684	(11,184)	87,801
State and local	2,018	(3,328)	4,600
Foreign	34,983	49,851	801
Subtotal	46,685	35,339	93,202
Provision for income taxes	$ (53,850)	$ (45,451)	$ (23,224)