Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	$ 45,137	$ 8,285
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	45,137	8,285
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(11,840)	(3,209)
Fair value of derivative assets, Net	33,297	5,076
Derivative liabilities	15,058	40,847
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	15,058	40,847
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(11,840)	(3,209)
Fair value of derivative liabilities, Net	3,218	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	(1,432)	(490)
Fair value of derivative assets, Net	(1,432)	(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	(1,432)	(490)
Fair value of derivative liabilities, Net	(1,432)	(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	25,445	2,379
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	25,445	2,379
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(8,099)	(2,379)
Fair value of derivative assets, Net	17,346	0
Derivative liabilities	8,505	29,777
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	8,505	29,777
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(8,099)	(2,379)
Fair value of derivative liabilities, Net	406	27,398
Not designated as hedging instruments [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	19,692	5,906
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	19,692	5,906
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(2,309)	(340)
Fair value of derivative assets, Net	17,383	5,566
Derivative liabilities	6,553	11,070
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	6,553	11,070
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(2,309)	(340)
Fair value of derivative liabilities, Net	4,244	10,730
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	5,233	5,076
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	5,233	5,076
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0
Fair value of derivative assets, Net	5,233	5,076
Derivative liabilities	2,173	3,503
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	2,173	3,503
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0	0
Fair value of derivative liabilities, Net	2,173	3,503
Not designated as hedging instruments [Member] \| Economic hedges of embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	43	325
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	43	325
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(43)
Fair value of derivative assets, Net	0	325
Derivative liabilities	1,160	20
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	1,160	20
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(43)
Fair value of derivative liabilities, Net	1,117	20
Not designated as hedging instruments [Member] \| Foreign currency forward contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	14,416	505
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	14,416	505
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(2,266)	(340)
Fair value of derivative assets, Net	12,150	165
Derivative liabilities	3,220	7,547
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	3,220	7,547
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(2,266)	(340)
Fair value of derivative liabilities, Net	$ 954	$ 7,207

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

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