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Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2017			$ (785,189)
Net Change	$ (44,154)	$ 27,374	(134,835)	$ 165,195
September 30, 2018	(922,148)		(922,148)
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			(352,948)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
September 30, 2018	(929,808)		(929,808)
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			37,384
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
September 30, 2018	13,193		13,193
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			180,694
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
September 30, 2018	(4,609)		(4,609)
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			35
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
September 30, 2018	(924)		(924)
Comprehensive income [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2017			(785,189)
Net Change			(134,835)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(2,124)
September 30, 2018	(922,148)		(922,148)
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)
September 30, 2018	$ 0		$ 0