Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	$ 58,140	$ 8,285
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	58,140	8,285
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(5,456)	(3,209)
Fair value of derivative assets, Net	52,684	5,076
Derivative liabilities	7,378	40,847
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	7,378	40,847
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(5,456)	(3,209)
Fair value of derivative liabilities, Net	1,922	37,638
Additional netting benefit [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts		0
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(1,245)	(490)
Fair value of derivative assets, Net	(1,245)	(490)
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(1,245)	(490)
Fair value of derivative liabilities, Net	(1,245)	(490)
Designated as hedging instruments [Member] \| Foreign currency forward contracts designated as cash flow hedges
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	29,965	2,379
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	29,965	2,379
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(3,549)	(2,379)
Fair value of derivative assets, Net	26,416	0
Derivative liabilities	3,549	29,777
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	3,549	29,777
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(3,549)	(2,379)
Fair value of derivative liabilities, Net	0	27,398
Not designated as hedging instruments [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	28,175	5,906
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	28,175	5,906
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(662)	(340)
Fair value of derivative assets, Net	27,513	5,566
Derivative liabilities	3,829	11,070
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	3,829	11,070
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(662)	(340)
Fair value of derivative liabilities, Net	3,167	10,730
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	5,648	5,076
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	5,648	5,076
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0
Fair value of derivative assets, Net	5,648	5,076
Derivative liabilities	1,922	3,503
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	1,922	3,503
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0	0
Fair value of derivative liabilities, Net	1,922	3,503
Not designated as hedging instruments [Member] \| Economic hedges of embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	24	325
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	24	325
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(10)
Fair value of derivative assets, Net	14	325
Derivative liabilities	300	20
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	300	20
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(10)
Fair value of derivative liabilities, Net	290	20
Not designated as hedging instruments [Member] \| Foreign currency forward contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	22,503	505
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	22,503	505
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(652)	(340)
Fair value of derivative assets, Net	21,851	165
Derivative liabilities	1,607	7,547
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	1,607	7,547
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(652)	(340)
Fair value of derivative liabilities, Net	$ 955	$ 7,207

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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