Stockholder's Equity - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				$ 1,595,468
Acquisition of NCI				(6,775)
Other comprehensive income (loss), net of tax		$ 2,587	$ (1,468)	13,273	$ 26,591
Ending Balance		1,759,925		1,759,925
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(42,074)	(37,295)	(42,082)	(29,925)
Other comprehensive income (loss) before reclassification		(784)	(5,031)	(776)	(12,401)
Amounts reclassified from AOCI	[1]	(5,933)		(5,933)
Other comprehensive income (loss), net of tax		(6,717)	(5,031)	(6,709)	(12,401)
Ending Balance		(48,791)	(42,326)	(48,791)	(42,326)
Unrealized Holding Gain (Loss) on Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		308	264	269	247
Other comprehensive income (loss) before reclassification		38	(3)	77	14
Other comprehensive income (loss), net of tax		38	(3)	77	14
Ending Balance		346	261	346	261
Gain (Loss) on Derivative [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[2]	(14,425)	(28,844)	(25,082)	(64,277)
Other comprehensive income (loss) before reclassification	[2]	4,971	4,228	15,183	14,458
Acquisition of NCI	[2]			2,284
Amounts reclassified from AOCI	[2],[3]	4,295	(651)	2,456	24,552
Other comprehensive income (loss), net of tax	[2]	9,266	3,577	19,923	39,010
Ending Balance	[2]	(5,159)	(25,267)	(5,159)	(25,267)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(56,191)	(65,875)	(66,895)	(93,955)
Other comprehensive income (loss) before reclassification		4,225	(806)	14,484	2,071
Acquisition of NCI				2,284
Amounts reclassified from AOCI		(1,638)	(651)	(3,477)	24,552
Other comprehensive income (loss), net of tax		2,587	(1,457)	13,291	26,623
Ending Balance		$ (53,604)	$ (67,332)	$ (53,604)	$ (67,332)

[1] Release of CTA to Other non-operating income (expense), net, on liquidation of certain foreign entities

[2] Refer to Note 11, Derivative Financial Instruments, for additional details

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