Income Taxes - Schedule of Provision for Income Taxes on Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S.
Current	$ 9,480	$ 3,620	$ 558
Deferred	(3,430)	20,222	9,296
Total U.S	6,050	23,842	9,854
Non-U.S.
Current	2,255	4,062	4,509
Deferred	769	1,196	1,164
Total Non U.S	3,024	5,258	5,673
Income tax expense	$ 9,074	$ 29,100	$ 15,527