Income Taxes (Detail) - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits, Excluding Interest and Penalties - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 25,911	$ 20,645
Additions based on tax positions related to the current year	7,086	5,150
Additions for tax positions of prior years	6,443	7,839
Reductions for tax positions of prior years	(496)	(3,880)
Reductions for expiration of statutes	(1,006)	(2,287)
Settlements	(544)	(960)
Change in foreign currency exchange rates	(295)	(596)
Ending balance	$ 37,099	$ 25,911