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Income Taxes - Summary of Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current
Federal	$ 466	$ 12,733	$ 7,504
State	(150)	1,141	279
International	6,458	477	(29)
Total Current	6,774	14,351	7,754
Deferred
Federal	8,024	647	(585)
State	1,882	73	(66)
International	4,167	(3,405)	(41)
Total Deferred	14,073	(2,685)	(692)
Total Provision for Income Taxes	$ 20,847	$ 11,666	$ 7,062

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