Income Taxes - Components of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 3,525	$ 8,866	$ 12,545
State	287	467	299
Non-US	7,783	6,581	7,380
Current provision for income taxes	11,595	15,914	20,224
Deferred:
Federal	(2,177)	572	2,673
State	(300)	280	198
Non-US	(373)	(1,022)	(159)
Deferred provision for income taxes	(2,850)	(170)	2,712
Provision for income taxes	$ 8,745	$ 15,744	$ 22,936