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Derivatives and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Foreign currency translation adjustment (CTA) gain (loss)	$ (77,566)	$ 100,909	$ (352,948)	$ 408,830
Gains from ineffective and excluded portions of cash flow hedges	3,900		10,300	3,600
Losses reclassified from AOCI into income, effective portion	3,300		34,600	13,400
Gains reclassified from AOCI into income, effective portion			17,500	25,800
Designated as hedging instruments [Member]
Derivative [Line Items]
Total principal amount of foreign currency loans designated as net investment hedges	4,190,800		4,190,800		$ 3,149,500
Foreign currency translation adjustment (CTA) gain (loss)	27,200	(60,700)	179,000	(191,100)
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Net gains (losses) on embedded derivatives				(6,300)
Not designated as hedging instruments [Member] \| Foreign currency forward contracts designated as cash flow hedges
Derivative [Line Items]
Net gain (loss) in foreign currency forward and options contracts	$ 17,100	$ (23,100)	$ 60,700	$ (60,200)