Intangible Assets and Goodwill - Schedule of Changes in Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Changes to goodwill
Beginning Balance	$ 72,463	$ 72,781
Effect of changes in foreign currency exchange rates	(592)	(318)
Ending Balance	$ 71,871	$ 72,463