Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair value of derivative assets, gross amounts	$ 73,074	$ 8,285
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	73,074	8,285
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(6,517)	(3,209)
Fair value of derivative assets, net	66,557	5,076
Fair value of derivative liabilities, gross Amounts	9,740	40,847
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	9,740	40,847
Fair value of derivative liabilities, gross amounts not offset in the consolidated balance sheet	(6,517)	(3,209)
Fair value of derivative liabilities, net	3,223	37,638
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	(2,607)	(490)
Fair value of derivative assets, net	(2,607)	(490)
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	(2,607)	(490)
Fair value of derivative liabilities, net	(2,607)	(490)
Designated as hedging instruments \| Foreign currency forward contracts designated as cash flow hedges
Derivative [Line Items]
Fair value of derivative assets, gross amounts	38,606	2,379
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	38,606	2,379
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(865)	(2,379)
Fair value of derivative assets, net	37,741	0
Fair value of derivative liabilities, gross Amounts	865	29,777
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	865	29,777
Fair value of derivative liabilities, gross amounts not offset in the consolidated balance sheet	(865)	(2,379)
Fair value of derivative liabilities, net		27,398
Not designated as hedging instruments
Derivative [Line Items]
Fair value of derivative assets, gross amounts	34,468	5,906
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	34,468	5,906
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(3,045)	(340)
Fair value of derivative assets, net	31,423	5,566
Fair value of derivative liabilities, gross Amounts	8,875	11,070
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	8,875	11,070
Fair value of derivative liabilities, gross amounts not offset in the consolidated balance sheet	(3,045)	(340)
Fair value of derivative liabilities, net	5,830	10,730
Not designated as hedging instruments \| Embedded derivatives
Derivative [Line Items]
Fair value of derivative assets, gross amounts	4,656	5,076
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	4,656	5,076
Fair value of derivative assets, net	4,656	5,076
Fair value of derivative liabilities, gross Amounts	2,426	3,503
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	2,426	3,503
Fair value of derivative liabilities, net	2,426	3,503
Not designated as hedging instruments \| Economic hedges of embedded derivatives
Derivative [Line Items]
Fair value of derivative assets, gross amounts	525	325
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	525	325
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(104)
Fair value of derivative assets, net	421	325
Fair value of derivative liabilities, gross Amounts	180	20
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	180	20
Fair value of derivative liabilities, gross amounts not offset in the consolidated balance sheet	(104)
Fair value of derivative liabilities, net	76	20
Not designated as hedging instruments \| Foreign currency forward contracts
Derivative [Line Items]
Fair value of derivative assets, gross amounts	29,287	505
Fair value of derivative assets, gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, net amounts	29,287	505
Fair value of derivative assets, gross amounts not offset in the consolidated balance sheet	(2,941)	(340)
Fair value of derivative assets, net	26,346	165
Fair value of derivative liabilities, gross Amounts	6,269	7,547
Fair value of derivative liabilities, gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, net amounts	6,269	7,547
Fair value of derivative liabilities, gross amounts not offset in the consolidated balance sheet	(2,941)	(340)
Fair value of derivative liabilities, net	$ 3,328	$ 7,207

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

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