Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 9,247	$ 7,820	$ 7,119
Deferred tax assets, net, current		16,861
Net foreign currency gains	$ 7,955	$ 7,820	$ 1,517