Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Value	$ 1,786,901	$ 1,895,692	$ 1,877,271
Other comprehensive income (loss) before reclassifications, net of tax	(76,305)	(23,173)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(1)	(40)
Other comprehensive income (loss):	(76,306)	(23,213)	(28,129)
Ending balance, Value	1,580,664	1,786,901	1,895,692
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Value	(52,261)	(28,781)
Other comprehensive income (loss) before reclassifications, net of tax	(76,410)	(23,480)
Other comprehensive income (loss):	(76,410)	(23,480)
Ending balance, Value	(128,671)	(52,261)	(28,781)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Value	(127)	(394)
Other comprehensive income (loss) before reclassifications, net of tax	105	307
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(1)	(40)
Other comprehensive income (loss):	104	267
Ending balance, Value	(23)	(127)	(394)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Value	(52,388)	(29,175)	(1,046)
Other comprehensive income (loss):	(76,306)	(23,213)	(28,129)
Ending balance, Value	$ (128,694)	$ (52,388)	$ (29,175)