Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	$ 1,580,664
Other comprehensive income (loss)	5,504	$ (17,193)
Accumulated other comprehensive income, net of tax, Ending balance	1,560,628
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	(128,671)
Other comprehensive income (loss) before reclassifications, net of tax	5,481
Other comprehensive income (loss)	5,481
Accumulated other comprehensive income, net of tax, Ending balance	(123,190)
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	(23)
Other comprehensive income (loss) before reclassifications, net of tax	23
Other comprehensive income (loss)	23
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net of tax, Beginning balance	(128,694)
Other comprehensive income (loss) before reclassifications, net of tax	5,504
Other comprehensive income (loss)	5,504
Accumulated other comprehensive income, net of tax, Ending balance	$ (123,190)