Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Fair value of derivative assets, gross amounts	$ 8,285	$ 69,979
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	8,285	69,979
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(3,209)	(9,434)
Fair value of derivative assets, net	5,076	60,545
Fair value of derivative liabilities, gross Amounts	40,847	10,959
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	40,847	10,959
Fair value of derivative liabilities, gross amounts not offset in the consolidated balance sheet	(3,209)	(9,434)
Fair value of derivative liabilities, net	37,638	1,525
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, net amounts		0
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(490)	(2,436)
Fair value of derivative assets, net	(490)	(2,436)
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 consolidated balance sheet	(490)	(2,436)
Fair value of derivative liabilities, net	(490)	(2,436)
Designated as hedging instruments
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 consolidated balance sheet		(5,125)
Fair value of derivative assets, net		46,375
Fair value of derivative liabilities, gross Amounts		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 consolidated balance sheet		(5,125)
Fair value of derivative liabilities, net		215
Designated as hedging instruments \| Foreign currency forward contracts designated as cash flow hedges
Derivative [Line Items]
Fair value of derivative assets, gross amounts	2,379	44,570
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	2,379	44,570
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(2,379)	(1,815)
Fair value of derivative assets, net	0	42,755
Fair value of derivative liabilities, gross Amounts	29,777	1,815
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	29,777	1,815
Fair value of derivative liabilities, gross amounts not offset in the consolidated balance sheet	(2,379)	(1,815)
Fair value of derivative liabilities, net	27,398
Designated as hedging instruments \| Foreign currency forward contracts
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 consolidated balance sheet		(3,310)
Fair value of derivative assets, net		3,620
Fair value of derivative liabilities, gross Amounts		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 consolidated balance sheet		(3,310)
Fair value of derivative liabilities, net		215
Not designated as hedging instruments
Derivative [Line Items]
Fair value of derivative assets, gross amounts	5,906	18,479
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	5,906	18,479
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(340)	(1,873)
Fair value of derivative assets, net	5,566	16,606
Fair value of derivative liabilities, gross Amounts	11,070	5,619
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	11,070	5,619
Fair value of derivative liabilities, gross amounts not offset in the consolidated balance sheet	(340)	(1,873)
Fair value of derivative liabilities, net	10,730	3,746
Not designated as hedging instruments \| Embedded derivatives
Derivative [Line Items]
Fair value of derivative assets, gross amounts	5,076	9,745
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	5,076	9,745
Fair value of derivative assets, net	5,076	9,745
Fair value of derivative liabilities, gross Amounts	3,503	1,525
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	3,503	1,525
Fair value of derivative liabilities, net	3,503	1,525
Not designated as hedging instruments \| Economic hedges of embedded derivatives
Derivative [Line Items]
Fair value of derivative assets, gross amounts	325
Fair value of derivative assets, gross amounts offset in the balance sheet	0
Fair value of derivative assets, net amounts	325
Fair value of derivative assets, net	325
Fair value of derivative liabilities, gross Amounts	20	866
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	20	866
Fair value of derivative liabilities, net	20	866
Not designated as hedging instruments \| Foreign currency forward contracts
Derivative [Line Items]
Fair value of derivative assets, gross amounts	505	8,734
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	505	8,734
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(340)	(1,873)
Fair value of derivative assets, net	165	6,861
Fair value of derivative liabilities, gross Amounts	7,547	3,228
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	7,547	3,228
Fair value of derivative liabilities, gross amounts not offset in the consolidated balance sheet	(340)	(1,873)
Fair value of derivative liabilities, net	$ 7,207	$ 1,355

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

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