Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1,	$ 9,836	$ 13,199
Gross increases for tax positions of prior years	9,683	55
Gross increases for tax positions of current year	4,961	1,456
Decreases due to settlements and other prior year tax positions	(178)	(2,346)
Decreases for lapse of statute of limitations	(1,364)	(1,586)
Currency translation effect on foreign balances	(429)	(942)
Balance at December 31,	22,509	9,836
Reserves related to potential interest at December 31,	907	732
Unrecognized tax benefits at December 31,	$ 23,416	$ 10,568