Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 27,210		$ 27,821
Decrease in goodwill offset amount due to foreign currency fluctuations	611
Gross goodwill before impairments	28,959		$ 29,570
Aggregate amortization expense on intangible assets	$ 25	$ 35