Stockholder's Equity - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				$ 1,595,468
Acquisition of NCI				(6,775)
Other comprehensive income, net of tax		$ 8,293	$ 606	10,686	$ 28,059
Ending Balance		1,660,496		1,660,496
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(41,843)	(33,268)	(42,082)	(29,925)
Other comprehensive income (loss) before reclassification		(231)	(4,027)	8	(7,370)
Other comprehensive income, net of tax		(231)	(4,027)	8	(7,370)
Ending Balance		(42,074)	(37,295)	(42,074)	(37,295)
Unrealized holding gain (loss) on investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		288	252	269	247
Other comprehensive income (loss) before reclassification		20	12	39	17
Other comprehensive income, net of tax		20	12	39	17
Ending Balance		308	264	308	264
Gain (loss) on derivatives[Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(22,929)	(33,473)	(25,082)	(64,277)
Other comprehensive income (loss) before reclassification	[1]	4,610	(10,304)	10,212	10,230
Acquisition of NCI	[1]	2,284		2,284
Amounts reclassified from AOCI	[1],[2]	1,610	14,933	(1,839)	25,203
Other comprehensive income, net of tax	[1]	8,504	4,629	10,657	35,433
Ending Balance	[1]	(14,425)	(28,844)	(14,425)	(28,844)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			(66,489)	(66,895)	(93,955)
Other comprehensive income (loss) before reclassification		4,399	(14,319)	10,259	2,877
Acquisition of NCI		2,284		2,284
Amounts reclassified from AOCI		1,610	14,933	(1,839)	25,203
Other comprehensive income, net of tax		8,293	614	10,704	28,080
Ending Balance		$ (56,191)	$ (65,875)	$ (56,191)	$ (65,875)

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

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