Investment in ECN Capital Corporation - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions	1 Months Ended
	Sep. 30, 2023	Apr. 01, 2023
Schedule of Equity Method Investments [Line Items]
Investment in the common stock	$ 1,587	$ 1,585
Carrying amount of preferred shares	64,500
Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Aggregate cost of investments	2,500
ECN Capital Corp.
Schedule of Equity Method Investments [Line Items]
Equity investments in ECN	$ 137,800
Common shares purchased	33.6
Percentage of common stock outstanding	12.00%
Cash dividend on preferred Shares	4.00%
Voting shares	19.90%
Investment in the common stock	$ 78,900
Aggregate cost of investments	3,100
Commitments on retailer floor plan loans outstanding	$ 55,700
ECN Capital Corp. | Mandatory convertible preferred shares
Schedule of Equity Method Investments [Line Items]
Number of shares issued	27.5