- Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - 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]
Balance at January 1,	$ 22,509	$ 9,836
Gross increases for tax positions of prior years	3,065	9,683
Gross increases for tax positions of current year	4,672	4,961
Decreases due to settlements and other prior year tax positions	(3,424)	(178)
Decreases for lapse of statute of limitations	(1,782)	(1,364)
Currency translation effect on foreign balances	(39)	(429)
Balance at December 31,	25,001	22,509
Reserves related to potential interest at December 31,	1,389	907
Unrecognized tax benefits at December 31,	$ 26,390	$ 23,416