Income Taxes - Components of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 7,568	$ 14,836	$ 3,525
State	1,414	106	287
Non-US	17,530	12,770	7,783
Current provision for income taxes	26,512	27,712	11,595
Deferred:
Federal	(5,642)	(6,222)	(2,177)
State	(724)	371	(300)
Non-US	(3,739)	(2,161)	(373)
Deferred provision for income taxes	(10,105)	(8,012)	(2,850)
Provision for income taxes	$ 16,407	$ 19,700	$ 8,745