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Income Taxes - Reconciliation of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Benefit from for income taxes at U.S. Federal statutory rate	$ (29,648)	$ (28,150)	$ (5,624)
Differential in rates on foreign earnings	15,920	11,741	1,584
Non-deductible amortization expense	0	617	947
Tax Reform Tax rate reduction	14,527
Change in valuation allowance	(2,834)	4,465	2,230
Change in liabilities for uncertain tax positions	(2,009)	(960)	(1,083)
Non-deductible stock-based compensation	1,934	1,480	1,398
Non-deductible meals and entertainment	380	441	395
Non-deductible acquisition cost	0	0	457
Adjustments related to tax positions taken during prior years	(473)	(163)	(781)
Adjustments made under intercompany transactions	0	1,779
Tax Refund	(834)
Other	1,285	634	70
Total benefit from income taxes	$ (1,752)	$ (8,116)	$ (407)

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