Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	$ 8,985	$ 8,285
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	8,985	8,285
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(5,074)	(3,209)
Fair value of derivative assets, Net	3,911	5,076
Derivative liabilities	39,984	40,847
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	39,984	40,847
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(5,074)	(3,209)
Fair value of derivative liabilities, Net	34,910	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	(3,867)	(490)
Fair value of derivative assets, Net	(3,867)	(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	(3,867)	(490)
Fair value of derivative liabilities, Net	(3,867)	(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	1,207	2,379
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	1,207	2,379
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(1,207)	(2,379)
Fair value of derivative assets, Net	0	0
Derivative liabilities	34,097	29,777
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	34,097	29,777
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(1,207)	(2,379)
Fair value of derivative liabilities, Net	32,890	27,398
Not designated as hedging instruments [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	7,778	5,906
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	7,778	5,906
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0	(340)
Fair value of derivative assets, Net	7,778	5,566
Derivative liabilities	5,887	11,070
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	5,887	11,070
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0	(340)
Fair value of derivative liabilities, Net	5,887	10,730
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	3,911	5,076
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	3,911	5,076
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0
Fair value of derivative assets, Net	3,911	5,076
Derivative liabilities	4,703	3,503
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	4,703	3,503
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0	0
Fair value of derivative liabilities, Net	4,703	3,503
Not designated as hedging instruments [Member] \| Economic hedges of embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	403	325
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	403	325
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0
Fair value of derivative assets, Net	403	325
Derivative liabilities	18	20
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	18	20
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0
Fair value of derivative liabilities, Net	18	20
Not designated as hedging instruments [Member] \| Foreign currency forward contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts	3,464	505
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	3,464	505
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0	(340)
Fair value of derivative assets, Net	3,464	165
Derivative liabilities	1,166	7,547
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	1,166	7,547
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0	(340)
Fair value of derivative liabilities, Net	$ 1,166	$ 7,207

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

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