Income Taxes - Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
U.S. Federal	$ 0	$ 0	$ 0
State	1,017	420	37
Foreign	6,968	5,940	7,082
Total current expense	7,985	6,360	7,119
Deferred:
U.S. Federal	(11,033)	(13,391)	1,625
State	(6,440)	(1,869)	(382)
U.S. deferred tax valuation allowance	1,882		(1,434)
Foreign	(1,707)	(1,618)	(1,142)
Total deferred expense (benefit)	(17,298)	(16,878)	(1,333)
Total expense (benefit)	$ (9,313)	$ (10,518)	$ 5,786