Financial Instruments and Fair Value Measurements - Schedule of Reconciliation of Financial Assets Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Finance Receivables of Consolidated CFEs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Losses included in other income	$ 75,064	$ 24,231
Finance Receivables of Consolidated CFEs | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Beginning Balance	77,904
Reclassification of finance receivables held for sale to finance receivables at fair value	248,081
Acquired in business combination		262,644
Transfer within Level 3 categories	23,338	(51,330)
Consolidation of VIEs	180,706
Losses included in other income	(86,331)	(29,825)
Sales		(24,312)
Paydowns	(151,032)	(90,410)
Other	24,332	11,137
Fair Value, Ending Balance	316,998	77,904
Finance Receivables at Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Losses included in other income	(2,103)	11,624
Finance Receivables at Fair Value | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Beginning Balance	75,270
Acquired in business combination		34,283
Transfer within Level 3 categories	(23,338)	51,330
Losses included in other income	(1,683)	(14,388)
Issuances, net of discount	3,392	56,484
Sales		(14,114)
Paydowns	(23,716)	(41,980)
Other	1,747	3,655
Fair Value, Ending Balance	$ 31,672	75,270
Securitization Debt of Consolidated CFEs | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Acquired in business combination		275,394
Transfer out of Level 3		$ (275,394)