Stockholder's Equity - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (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]
Beginning Balance				$ 1,546,721
Other comprehensive income (loss) before reclassification		$ (806)	$ (37,609)	2,071	$ (70,992)
Amounts reclassified from AOCI		(651)	27,548	24,552	64,715
Net current period other comprehensive income (loss)		(1,457)	(10,061)	26,623	(6,277)
Ending Balance		1,596,303		1,596,303
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(37,295)	(22,198)	(29,925)	(15,212)
Other comprehensive income (loss) before reclassification		(5,031)	(9,333)	(12,401)	(14,076)
Amounts reclassified from AOCI					(2,243)
Net current period other comprehensive income (loss)		(5,031)	(9,333)	(12,401)	(16,319)
Ending Balance		(42,326)	(31,531)	(42,326)	(31,531)
Unrealized holding gain (loss) on investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		264	257	247	241
Other comprehensive income (loss) before reclassification		(3)	(27)	14	(11)
Net current period other comprehensive income (loss)		(3)	(27)	14	(11)
Ending Balance		261	230	261	230
Gain (loss) on derivatives[Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(28,844)	(72,083)	(64,277)	(82,837)
Other comprehensive income (loss) before reclassification	[1]	4,228	(28,249)	14,458	(56,905)
Amounts reclassified from AOCI	[1],[2]	(651)	27,548	24,552	66,958
Net current period other comprehensive income (loss)	[1]	3,577	(701)	39,010	10,053
Ending Balance	[1]	(25,267)	(72,784)	(25,267)	(72,784)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(65,875)	(94,024)	(93,955)	(97,808)
Ending Balance		$ (67,332)	$ (104,085)	$ (67,332)	$ (104,085)

[1] Refer to Note 9 for additional details.

[2] Reclassified to Cost of operations and Gain on foreign currency, net.