Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	$ 68,900	$ 22,739
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	68,900	22,739
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(44,902)	(646)
Fair value of derivative assets, Net	23,998	22,093
Fair value of derivative liabilities, Gross Amounts	79,925	810
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	79,925	810
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(44,902)	(646)
Fair value of derivative liabilities, Net	35,023	164
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, Net amounts		0
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(9,512)	(508)
Fair value of derivative assets, Net	(9,512)	(508)
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts		0
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(9,512)	(508)
Fair value of derivative liabilities, Net	(9,512)	(508)
Designated as hedging instruments [Member] \| Foreign currency forward and option contracts [Member]
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
Designated as hedging instruments [Member] \| Foreign currency forward contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts		8,404
Fair value of derivative assets, Gross amounts offset in the balance sheet		0
Fair value of derivative assets, Net amounts		8,404
Fair value of derivative assets, Net		8,404
Fair value of derivative liabilities, Gross Amounts	813
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	813	0
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(813)
Fair value of derivative liabilities, Net		0
Not designated as hedging instruments [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	52,873	14,335
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	52,873	14,335
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(34,577)	(138)
Fair value of derivative assets, Net	18,296	14,197
Fair value of derivative liabilities, Gross Amounts	79,112	810
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	79,112	810
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(34,577)	(138)
Fair value of derivative liabilities, Net	44,535	672
Not designated as hedging instruments [Member] \| Foreign currency forward and option contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts		5,153
Fair value of derivative assets, Gross amounts offset in the balance sheet		0
Fair value of derivative assets, Net amounts		5,153
Fair value of derivative assets, Gross amounts not offset in the balance sheet		(138)
Fair value of derivative assets, Net		5,015
Fair value of derivative liabilities, Gross Amounts		416
Fair value of derivative liabilities, Gross amounts offset in the balance sheet		0
Fair value of derivative liabilities, Net amounts		416
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet		(138)
Fair value of derivative liabilities, Net		278
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	8,926	9,182
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	8,926	9,182
Fair value of derivative assets, Net	8,926	9,182
Fair value of derivative liabilities, Gross Amounts	1,772	4
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	1,772	4
Fair value of derivative liabilities, Net	1,772	4
Not designated as hedging instruments [Member] \| Economic hedges of embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	744
Fair value of derivative assets, Gross amounts offset in the balance sheet	0
Fair value of derivative assets, Net amounts	744
Fair value of derivative assets, Net	744
Fair value of derivative liabilities, Gross Amounts	417	390
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	417	390
Fair value of derivative liabilities, Net	417	$ 390
Not designated as hedging instruments [Member] \| Foreign currency forward contracts [Member]
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
Fair value of derivative liabilities, Gross Amounts	76,923
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0
Fair value of derivative liabilities, Net amounts	76,923
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(34,577)
Fair value of derivative liabilities, Net	$ 42,346

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

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