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Income Taxes - Components of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current
Federal	$ 4,592	$ (1,698)	$ 2,679
Foreign	5,998	5,115	2,951
State and local	126	32	345
Current, Total	10,716	3,449	5,975
Deferred
Federal	2,316	2,986	(611)
Foreign	12	(914)	(309)
State and local	108	177	(24)
Deferred Total	2,436	2,249	(944)
Income taxes	$ 13,152	$ 5,698	$ 5,031

X

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