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Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2017			$ (785,189)
Net Change	$ (159,825)	$ 71,415	(90,681)	$ 137,821
June 30, 2018	(877,994)		(877,994)
Foreign currency translation adjustment (“CTA”) loss [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2017			(576,860)
Net Change			(275,382)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
June 30, 2018	(852,242)		(852,242)
Unrealized loss on cash flow hedges [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2017			(24,191)
Net Change			31,200
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
June 30, 2018	7,009		7,009
Net investment hedge CTA gain (loss) [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2017			(185,303)
Net Change			153,480
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
June 30, 2018	(31,823)		(31,823)
Net actuarial gain (loss) on defined benefit plans [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2017			(959)
Net Change			21
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
June 30, 2018	(938)		(938)
Comprehensive income [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2017			(785,189)
Net Change			(90,681)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(2,124)
June 30, 2018	(877,994)		(877,994)
ASU 2016-01 [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative effect on retained earnings			2,100
ASU 2016-01 [Member] \| Unrealized gain (loss) on available-for-sale securities [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2017			2,124
Net Change			0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(2,124)
June 30, 2018	$ 0		$ 0