Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Fair value of derivative assets, gross amounts	$ 91,684	$ 68,900
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	91,684	68,900
Fair value of derivative assets, gross amounts not offset in the balance sheet	(2,819)	(44,902)
Fair value of derivative assets, net	88,865	23,998
Fair value of derivative liabilities, gross amounts	7,101	79,925
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	7,101	79,925
Fair value of derivative liabilities, gross amounts not offset in the balance sheet	(2,819)	(44,902)
Fair value of derivative liabilities, net	4,282	35,023
Additional netting benefit
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	(741)	(9,512)
Fair value of derivative assets, net	(741)	(9,512)
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	(741)	(9,512)
Fair value of derivative liabilities, net	(741)	(9,512)
Designated as hedging instruments
Derivative [Line Items]
Fair value of derivative assets, gross amounts	42,261
Fair value of derivative assets, gross amounts offset in the balance sheet	0
Fair value of derivative assets, net amounts	42,261
Fair value of derivative assets, gross amounts not offset in the balance sheet	(1,745)
Fair value of derivative assets, net	40,516
Fair value of derivative liabilities, gross amounts	1,849
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0
Fair value of derivative liabilities, net amounts	1,849
Fair value of derivative liabilities, gross amounts not offset in the balance sheet	(1,745)
Fair value of derivative liabilities, net	104
Designated as hedging instruments \| Foreign currency forward contracts
Derivative [Line Items]
Fair value of derivative liabilities, gross amounts		813
Fair value of derivative liabilities, gross amounts offset in the balance sheet		0
Fair value of derivative liabilities, net amounts		813
Fair value of derivative liabilities, gross amounts not offset in the balance sheet		(813)
Designated as hedging instruments \| Foreign currency forward contracts \| Cash flow hedges
Derivative [Line Items]
Fair value of derivative assets, gross amounts	29,714
Fair value of derivative assets, gross amounts offset in the balance sheet	0
Fair value of derivative assets, net amounts	29,714
Fair value of derivative assets, gross amounts not offset in the balance sheet	(1,745)
Fair value of derivative assets, net	27,969
Fair value of derivative liabilities, gross amounts	1,849
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0
Fair value of derivative liabilities, net amounts	1,849
Fair value of derivative liabilities, gross amounts not offset in the balance sheet	(1,745)
Fair value of derivative liabilities, net	104
Designated as hedging instruments \| Foreign currency forward contracts \| Net investment hedges
Derivative [Line Items]
Fair value of derivative assets, gross amounts	12,547
Fair value of derivative assets, gross amounts offset in the balance sheet	0
Fair value of derivative assets, net amounts	12,547
Fair value of derivative assets, gross amounts not offset in the balance sheet	0
Fair value of derivative assets, net	12,547
Fair value of derivative liabilities, gross amounts	0
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0
Fair value of derivative liabilities, net amounts	0
Fair value of derivative liabilities, gross amounts not offset in the balance sheet	0
Fair value of derivative liabilities, net	0
Designated as hedging instruments \| Foreign currency forward and option contracts
Derivative [Line Items]
Fair value of derivative assets, gross amounts		16,027
Fair value of derivative assets, gross amounts offset in the balance sheet		0
Fair value of derivative assets, net amounts		16,027
Fair value of derivative assets, gross amounts not offset in the balance sheet		(813)
Fair value of derivative assets, net		15,214
Not designated as hedging instruments
Derivative [Line Items]
Fair value of derivative assets, gross amounts	49,423	52,873
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	49,423	52,873
Fair value of derivative assets, gross amounts not offset in the balance sheet	(333)	(34,577)
Fair value of derivative assets, net	49,090	18,296
Fair value of derivative liabilities, gross amounts	5,252	79,112
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	5,252	79,112
Fair value of derivative liabilities, gross amounts not offset in the balance sheet	(333)	(34,577)
Fair value of derivative liabilities, net	4,919	44,535
Not designated as hedging instruments \| Foreign currency forward contracts
Derivative [Line Items]
Fair value of derivative assets, gross amounts		43,203
Fair value of derivative assets, gross amounts offset in the balance sheet		0
Fair value of derivative assets, net amounts		43,203
Fair value of derivative assets, gross amounts not offset in the balance sheet		(34,577)
Fair value of derivative assets, net		8,626
Not designated as hedging instruments \| Embedded derivatives
Derivative [Line Items]
Fair value of derivative assets, gross amounts	3,864	8,926
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	3,864	8,926
Fair value of derivative assets, gross amounts not offset in the balance sheet	0
Fair value of derivative assets, net	3,864	8,926
Fair value of derivative liabilities, gross amounts	4,281	1,772
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	4,281	1,772
Fair value of derivative liabilities, gross amounts not offset in the balance sheet	0
Fair value of derivative liabilities, net	4,281	1,772
Not designated as hedging instruments \| Economic hedges of embedded derivatives
Derivative [Line Items]
Fair value of derivative assets, gross amounts	2,719	744
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	2,719	744
Fair value of derivative assets, gross amounts not offset in the balance sheet	(62)
Fair value of derivative assets, net	2,657	744
Fair value of derivative liabilities, gross amounts	62	417
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	62	417
Fair value of derivative liabilities, gross amounts not offset in the balance sheet	(62)
Fair value of derivative liabilities, net	0	417
Not designated as hedging instruments \| Foreign currency forward and option contracts
Derivative [Line Items]
Fair value of derivative assets, gross amounts	42,840
Fair value of derivative assets, gross amounts offset in the balance sheet	0
Fair value of derivative assets, net amounts	42,840
Fair value of derivative assets, gross amounts not offset in the balance sheet	(271)
Fair value of derivative assets, net	42,569
Fair value of derivative liabilities, gross amounts	909	76,923
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	909	76,923
Fair value of derivative liabilities, gross amounts not offset in the balance sheet	(271)	(34,577)
Fair value of derivative liabilities, net	$ 638	$ 42,346

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

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