Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance			$ 1,786,901
Other comprehensive income (loss) before reclassifications, net of tax	$ (6,037)		(54,166)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			(1)
Other comprehensive income (loss):	(6,037)	$ (16,729)	(54,167)	$ (12,239)
Accumulated other comprehensive income, net of tax, Ending balance	1,646,845		1,646,845
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	(100,521)		(52,261)
Other comprehensive income (loss) before reclassifications, net of tax	(6,030)		(54,290)
Other comprehensive income (loss):	(6,030)		(54,290)
Accumulated other comprehensive income, net of tax, Ending balance	(106,551)		(106,551)
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	3		(127)
Other comprehensive income (loss) before reclassifications, net of tax	(7)		124
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			(1)
Other comprehensive income (loss):	(7)		123
Accumulated other comprehensive income, net of tax, Ending balance	(4)		(4)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	(100,518)		(52,388)
Accumulated other comprehensive income, net of tax, Ending balance	$ (106,555)		$ (106,555)