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Derivatives and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Foreign currency translation adjustment (CTA) gain (loss)	$ (421,233)	$ 200,983	$ (275,382)	$ 307,921
Gains from ineffective and excluded portions of cash flow hedges	2,700		2,700
Losses reclassified from AOCI into income, effective portion	12,900	5,600	31,300	14,600
Gains reclassified from AOCI into income, effective portion	6,800	10,500	16,100	28,200
Designated as hedging instruments [Member]
Derivative [Line Items]
Total principal amount of foreign currency loans designated as net investment hedges	3,864,400		3,864,400		$ 3,149,500
Foreign currency translation adjustment (CTA) gain (loss)	226,100	(101,800)	151,800	(130,400)
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Net gains (losses) on embedded derivatives	(3,900)			6,800
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	$ 49,800	$ (22,500)	$ 47,400	$ (37,200)