Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	$ 41,978	$ 69,979
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	41,978	69,979
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(2,600)	(9,434)
Fair value of derivative assets, Net	39,378	60,545
Derivative liabilities	5,355	10,959
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	5,355	10,959
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(2,600)	(9,434)
Fair value of derivative liabilities, Net	2,755	1,525
Additional netting benefit [Member]
Derivative [Line Items]
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	(113)	(2,436)
Fair value of derivative assets, Net	(113)	(2,436)
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	(113)	(2,436)
Fair value of derivative liabilities, Net	(113)	(2,436)
Designated as hedging instruments [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts		51,500
Fair value of derivative assets, Gross amounts offset in the balance sheet		0
Fair value of derivative assets, Net amounts		51,500
Fair value of derivative assets, Gross amounts not offset in the balance sheet		(5,125)
Fair value of derivative assets, Net		46,375
Derivative liabilities		5,340
Fair value of derivative liabilities, Gross amounts offset in the balance sheet		0
Fair value of derivative liabilities, Net amounts		5,340
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet		(5,125)
Fair value of derivative liabilities, Net		215
Designated as hedging instruments [Member] \| Foreign currency forward and option contracts [Member] \| Cash flow hedges [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts		44,570
Fair value of derivative assets, Gross amounts offset in the balance sheet		0
Fair value of derivative assets, Net amounts		44,570
Fair value of derivative assets, Gross amounts not offset in the balance sheet		(1,815)
Fair value of derivative assets, Net		42,755
Derivative liabilities		1,815
Fair value of derivative liabilities, Gross amounts offset in the balance sheet		0
Fair value of derivative liabilities, Net amounts		1,815
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet		(1,815)
Fair value of derivative liabilities, Net		0
Designated as hedging instruments [Member] \| Foreign currency forward contracts [Member] \| Cash flow hedges [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	30,350
Fair value of derivative assets, Gross amounts offset in the balance sheet	0
Fair value of derivative assets, Net amounts	30,350
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(2,315)
Fair value of derivative assets, Net	28,035
Derivative liabilities	2,315
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0
Fair value of derivative liabilities, Net amounts	2,315
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(2,315)
Fair value of derivative liabilities, Net	0
Designated as hedging instruments [Member] \| Foreign currency forward contracts [Member] \| Net investment hedges [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts		6,930
Fair value of derivative assets, Gross amounts offset in the balance sheet		0
Fair value of derivative assets, Net amounts		6,930
Fair value of derivative assets, Gross amounts not offset in the balance sheet		(3,310)
Fair value of derivative assets, Net		3,620
Derivative liabilities		3,525
Fair value of derivative liabilities, Gross amounts offset in the balance sheet		0
Fair value of derivative liabilities, Net amounts		3,525
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet		(3,310)
Fair value of derivative liabilities, Net		215
Not designated as hedging instruments [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	11,628	18,479
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	11,628	18,479
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(172)	(1,873)
Fair value of derivative assets, Net	11,456	16,606
Derivative liabilities	3,040	5,619
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	3,040	5,619
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(172)	(1,873)
Fair value of derivative liabilities, Net	2,868	3,746
Not designated as hedging instruments [Member] \| Foreign currency forward contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	5,175	8,734
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	5,175	8,734
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(156)	(1,873)
Fair value of derivative assets, Net	5,019	6,861
Derivative liabilities	269	3,228
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	269	3,228
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(156)	(1,873)
Fair value of derivative liabilities, Net	113	1,355
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	6,196	9,745
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	6,196	9,745
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0
Fair value of derivative assets, Net	6,196	9,745
Derivative liabilities	2,755	1,525
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	2,755	1,525
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0
Fair value of derivative liabilities, Net	2,755	1,525
Not designated as hedging instruments [Member] \| Economic hedges of embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	257
Fair value of derivative assets, Gross amounts offset in the balance sheet	0
Fair value of derivative assets, Net amounts	257
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(16)
Fair value of derivative assets, Net	241
Derivative liabilities	16	866
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	16	866
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(16)
Fair value of derivative liabilities, Net	$ 0	$ 866

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

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