Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Finance receivables held for sale, Fair Value	$ 277,600,000	$ 0
Finance receivable fair value on non-recurring basis	108,100,000	34,800,000
Finance receivables held for sale, carrying value	363,029,000	503,546,000		$ 321,626,000
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Finance receivables held for sale, carrying value	254,900,000
Finance receivables held for sale, fair Value	$ 254,900,000	$ 468,800,000
2022-2 Securitization | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Finance receivables			$ 180,700,000
2023-1 Securitization | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Finance receivables held for sale, Fair Value			$ 248,100,000