Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 4,522	$ 4,486	$ 4,443
Additions based on tax position related to current year	221	1,758	80
Additions based on tax positions related to prior year	458	4	366
Reductions from settlements and statute of limitation expiration	(2,179)	(2,247)	(299)
Effect of foreign currency translation	(168)	529	(104)
Balance at end of year	$ 2,854	$ 4,522	$ 4,486