Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 25,593	$ 26,500	$ 27,821
Decrease in goodwill offset amount due to foreign currency fluctuations	907
Gross goodwill	27,342	28,249
Aggregate amortization expense on intangible assets	$ 71	$ 51	$ 68