Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 7,820	$ 7,119	$ 8,695
Net foreign currency gains (losses)	$ 7,820	$ 1,517	$ (1,687)