Income Taxes - Tax Provision before Discrete Items Reconciled to Recorded Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Provision for income taxes before discrete items	$ 3,500	$ 4,200	$ 7,600	$ 13,200
Interest related to unrecognized tax benefits	100		300	200
Benefit related to merger of Brazilian entities				(3,100)
Non-deductible stock compensation charge				300
Benefit related to U.S. transfer pricing adjustment			(400)
Benefit related to Spanish statutory and tax intangibles write-off			(300)
Deductions related to ESPP dispositions	(200)	(300)	(400)	(600)
Provision (benefit) for reassessment of taxes upon filing tax return	(1,800)	400	(1,800)	400
Benefit from reversals of uncertain tax positions due to statute of limitation expirations	(4,400)	(2,300)	(4,900)	(2,400)
Provision for (benefit from) income taxes	$ (2,756)	$ 2,047	$ 97	$ 8,025