Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Line Items]
Aggregate amortization expense on intangible assets	$ 51	$ 68	$ 288
Goodwill	26,500	27,821	$ 29,212
Decrease in goodwill offset amount due to foreign currency fluctuations	1,321
Gross goodwill	$ 28,249	$ 29,570