Income Taxes - Schedule of Provision for Income Taxes on Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S.
Current	$ 3,620	$ 558	$ 6,792
Deferred	20,222	9,296	(1,146)
Total U.S	23,842	9,854	5,646
Non-U.S.
Current	4,062	4,509	3,661
Deferred	1,196	1,164	1,542
Total Non U.S	5,258	5,673	5,203
Income tax expense	$ 29,100	$ 15,527	$ 10,849