Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	$ 18,453	$ 69,979
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	18,453	69,979
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(11,372)	(9,434)
Fair value of derivative assets, Net	7,081	60,545
Derivative liabilities	35,859	10,959
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	35,859	10,959
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(11,372)	(9,434)
Fair value of derivative liabilities, Net	24,487	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	(3,680)	(2,436)
Fair value of derivative assets, Net	(3,680)	(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	(3,680)	(2,436)
Fair value of derivative liabilities, Net	(3,680)	(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	29,762	1,815
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	29,762	1,815
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(5,441)	(1,815)
Fair value of derivative liabilities, Net	24,321	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	5,441
Fair value of derivative assets, Gross amounts offset in the balance sheet	0
Fair value of derivative assets, Net amounts	5,441
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(5,441)
Fair value of derivative assets, 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	13,012	18,479
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	13,012	18,479
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(2,251)	(1,873)
Fair value of derivative assets, Net	10,761	16,606
Derivative liabilities	6,097	5,619
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	6,097	5,619
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(2,251)	(1,873)
Fair value of derivative liabilities, Net	3,846	3,746
Not designated as hedging instruments [Member] \| Foreign currency forward contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	6,947	8,734
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	6,947	8,734
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(1,973)	(1,873)
Fair value of derivative assets, Net	4,974	6,861
Derivative liabilities	2,806	3,228
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	2,806	3,228
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(1,973)	(1,873)
Fair value of derivative liabilities, Net	833	1,355
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	5,096	9,745
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	5,096	9,745
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0
Fair value of derivative assets, Net	5,096	9,745
Derivative liabilities	3,013	1,525
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	3,013	1,525
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0
Fair value of derivative liabilities, Net	3,013	1,525
Not designated as hedging instruments [Member] \| Economic hedges of embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	969
Fair value of derivative assets, Gross amounts offset in the balance sheet	0
Fair value of derivative assets, Net amounts	969
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(278)
Fair value of derivative assets, Net	691
Derivative liabilities	278	866
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	278	866
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(278)
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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