Fair Value Measurement - Schedule of Significant Unobservable Inputs (Details) - Valuation Technique, Discounted Cash Flow	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Beneficial interest assets	7.00%	7.00%
Beneficial interest liabilities	14.00%	14.00%
Minimum | Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Beneficial interest assets	(1.44%)	(0.85%)
Beneficial interest liabilities	10.80%	0.09%
Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Beneficial interest assets	14.00%	14.00%
Beneficial interest liabilities	14.00%	14.00%
Maximum | Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Beneficial interest assets	3.70%	(0.85%)
Beneficial interest liabilities	16.80%	9.81%
Weighted Average | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Beneficial interest assets	13.68%	13.63%
Beneficial interest liabilities	14.00%	14.00%
Weighted Average | Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Beneficial interest assets	1.74%	(0.85%)
Beneficial interest liabilities	13.17%	8.79%
Fair Value, Inputs, Level 3 | Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	10.20%	9.63%
Loans held in consolidated securitization	0.0684	0.0685
Other notes receivable	0.0700
Notes receivable and residual certificates	0.1046	0.0999
Payable to securitization note holders	0.0684	0.0685
Trailing fee liabilities	10.20%	9.63%
Fair Value, Inputs, Level 3 | Minimum | Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	0.01%	0.01%
Loans held in consolidated securitization	0.0066	0.0061
Notes receivable and residual certificates	0.0048	0.0048
Payable to securitization note holders	0.0066	0.0061
Trailing fee liabilities	0.01%	0.01%
Fair Value, Inputs, Level 3 | Minimum | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	0.31%	0.13%
Loans held in consolidated securitization	0.0673	0.0666
Notes receivable and residual certificates	0.0636	0.0636
Payable to securitization note holders	0.0673	0.0666
Trailing fee liabilities	2.29%	1.05%
Fair Value, Inputs, Level 3 | Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	23.22%	23.22%
Loans held in consolidated securitization	0.1525	0.1600
Other notes receivable	0.0700
Notes receivable and residual certificates	0.2322	0.2322
Payable to securitization note holders	0.1157	0.1230
Trailing fee liabilities	23.22%	23.22%
Fair Value, Inputs, Level 3 | Maximum | Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	93.11%	93.10%
Loans held in consolidated securitization	0.3770	0.3770
Notes receivable and residual certificates	0.5027	0.5069
Payable to securitization note holders	0.3770	0.3770
Trailing fee liabilities	72.76%	88.42%
Fair Value, Inputs, Level 3 | Maximum | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	93.79%	95.80%
Loans held in consolidated securitization	0.8984	0.8984
Notes receivable and residual certificates	0.8946	0.8946
Payable to securitization note holders	0.8984	0.8984
Trailing fee liabilities	95.80%	94.68%
Fair Value, Inputs, Level 3 | Weighted Average | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	12.44%	12.06%
Loans held in consolidated securitization	0.0972	0.0999
Other notes receivable	0.0700
Notes receivable and residual certificates	0.1311	0.1274
Payable to securitization note holders	0.0867	0.0848
Trailing fee liabilities	13.20%	12.88%
Fair Value, Inputs, Level 3 | Weighted Average | Credit risk rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	17.54%	17.66%
Loans held in consolidated securitization	0.1554	0.1551
Notes receivable and residual certificates	0.1635	0.1632
Payable to securitization note holders	0.1554	0.1551
Trailing fee liabilities	18.00%	17.61%
Fair Value, Inputs, Level 3 | Weighted Average | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	34.74%	36.52%
Loans held in consolidated securitization	0.4216	0.4273
Notes receivable and residual certificates	0.4286	0.4314
Payable to securitization note holders	0.4216	0.4273
Trailing fee liabilities	38.04%	39.94%