Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Current provision:
Federal	$ (336)	$ (445)		$ (55)
State	163	137		135
Foreign	22,204	9,512		5,098
Total current provision	22,031	9,204		5,178
Deferred provision:
Federal	(2,026)	(5,934)		(4,462)
State	(377)	(886)		(746)
Foreign	(31,948)	1,056		3,860
Total deferred provision	(34,351)	(5,764)		(1,348)
Provision for (benefit from) income taxes	$ (12,320)	$ 3,440	[1]	$ 3,830	[1]

[1] As adjusted to reflect the impact of the full retrospective adoption of Topic 606.