Income Taxes - Reconciliation of Amounts of Unrecognized Net Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits as of January 1,	$ 13,285	$ 14,991	$ 16,897
Decreases due to lapse in applicable statute of limitations	(2,206)		(390)
Foreign currency translation increases (decreases)	(2,963)	(1,706)	(1,516)
Gross unrecognized tax benefits as of December 31,	$ 8,116	$ 13,285	$ 14,991