Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	$ (24,685)		$ (29,175)
Other comprehensive income (loss) before reclassifications, net of tax	(16,728)		(12,206)
Amounts reclassified from accumulated other comprehensive income, net of tax	(1)		(33)
Other comprehensive income (loss)	(16,729)	$ (21,640)	(12,239)	$ (3,464)
Accumulated other comprehensive income, net of tax, Ending balance	(41,414)		(41,414)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	(24,669)		(28,781)
Other comprehensive income (loss) before reclassifications, net of tax	(16,858)		(12,746)
Other comprehensive income (loss)	(16,858)		(12,746)
Accumulated other comprehensive income, net of tax, Ending balance	(41,527)		(41,527)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	(16)		(394)
Other comprehensive income (loss) before reclassifications, net of tax	130		540
Amounts reclassified from accumulated other comprehensive income, net of tax	(1)		(33)
Other comprehensive income (loss)	129		507
Accumulated other comprehensive income, net of tax, Ending balance	$ 113		$ 113