Stockholder's Equity - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 1,788,777
Net current period other comprehensive income		(359)
Ending Balance		1,838,953
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(49,025)	$ (42,082)
Other comprehensive income before reclassification		(596)	239
Net current period other comprehensive income		(596)	239
Ending Balance		(49,621)	(41,843)
Unrealized Holding Gain (Loss) on Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		393	269
Other comprehensive income before reclassification		7	19
Net current period other comprehensive income		7	19
Ending Balance		400	288
Gain (Loss) on Derivative [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(1,816)	(25,082)
Other comprehensive income before reclassification	[1]	481	5,602
Amounts reclassified from AOCI	[1],[2]	(251)	(3,449)
Net current period other comprehensive income	[1]	230	2,153
Ending Balance	[1]	(1,586)	(22,929)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(50,448)	(66,895)
Other comprehensive income before reclassification		(108)	5,860
Amounts reclassified from AOCI		(251)	(3,449)
Net current period other comprehensive income		(359)	2,411
Ending Balance		$ (50,807)	$ (64,484)

[1] Refer to Note 10, Derivative Financial Instruments, for additional details

[2] Reclassified to Cost of operations and Other non-operating income (expense), net