Indebtedness - Schedule of Debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total debt, net	$ 10,237,544	$ 8,399,149
Unused borrowing capacity	176,500
Recourse debt
Debt Instrument [Line Items]
Total debt, gross	917,247	905,158
Unamortized debt discount	(5,417)	(7,118)
Total debt, net	911,830	898,040
Unused borrowing capacity	31,000
Recourse debt | Bank Line Of Credit
Debt Instrument [Line Items]
Total debt, gross	517,247	$ 505,158
Unused borrowing capacity	$ 31,000
Weighted average interest rate	8.95%	6.01%
Recourse debt | Bank Line Of Credit | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate during period	3.25%
Recourse debt | 0% Convertible Senior Notes
Debt Instrument [Line Items]
Total debt, gross	$ 400,000	$ 400,000
Unused borrowing capacity	$ 0
Weighted average interest rate	0.00%	0.00%
Interest rate during period	0.00%
Non Recourse Debt
Debt Instrument [Line Items]
Total debt, gross	$ 9,409,701	$ 7,548,047
Total debt, net	9,325,714	7,501,109
Unused borrowing capacity	145,500
Non Recourse Debt | Senior revolving and delayed draw loans
Debt Instrument [Line Items]
Total debt, gross	1,404,702	$ 1,560,002
Unused borrowing capacity	$ 132,400
Weighted average interest rate	7.49%	6.49%
Non Recourse Debt | Senior revolving and delayed draw loans | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate during period	2.00%
Non Recourse Debt | Senior revolving and delayed draw loans | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Interest rate during period	3.10%
Non Recourse Debt | Senior non-revolving loans
Debt Instrument [Line Items]
Total debt, gross	$ 2,257,516	$ 1,680,444
Total debt, net	162,400
Unused borrowing capacity	$ 0
Weighted average interest rate	6.97%	6.00%
Non Recourse Debt | Senior non-revolving loans | Minimum
Debt Instrument [Line Items]
Interest rate during period	4.66%
Non Recourse Debt | Senior non-revolving loans | Maximum
Debt Instrument [Line Items]
Interest rate during period	6.93%
Non Recourse Debt | Senior non-revolving loans | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate during period	1.75%
Non Recourse Debt | Senior non-revolving loans | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Interest rate during period	2.50%
Non Recourse Debt | Subordinated revolving and delayed draw loans
Debt Instrument [Line Items]
Total debt, gross	$ 168,400	$ 333,800
Total debt, net	122,400
Unused borrowing capacity	$ 13,100
Weighted average interest rate	11.85%	9.58%
Non Recourse Debt | Subordinated revolving and delayed draw loans | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate during period	3.50%
Non Recourse Debt | Subordinated revolving and delayed draw loans | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Interest rate during period	9.10%
Non Recourse Debt | Subordinated Loans
Debt Instrument [Line Items]
Total debt, gross	$ 2,090,880	$ 1,442,336
Total debt, net	137,000
Unused borrowing capacity	$ 0
Weighted average interest rate	9.18%	8.76%
Non Recourse Debt | Subordinated Loans | Minimum
Debt Instrument [Line Items]
Interest rate during period	7.00%
Non Recourse Debt | Subordinated Loans | Maximum
Debt Instrument [Line Items]
Interest rate during period	10.50%
Non Recourse Debt | Subordinated Loans | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate during period	6.00%
Non Recourse Debt | Subordinated Loans | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Interest rate during period	6.75%
Non Recourse Debt | Subordinated Loans | Floating Rate
Debt Instrument [Line Items]
Total debt, net	$ 454,300
Non Recourse Debt | Securitized loans
Debt Instrument [Line Items]
Total debt, gross	3,488,203	$ 2,531,465
Unused borrowing capacity	$ 0
Weighted average interest rate	4.62%	3.87%
Non Recourse Debt | Securitized loans | Minimum
Debt Instrument [Line Items]
Interest rate during period	2.27%
Non Recourse Debt | Securitized loans | Maximum
Debt Instrument [Line Items]
Interest rate during period	6.60%
Unamortized debt discount, net
Debt Instrument [Line Items]
Unamortized debt discount, net	$ (83,987)	$ (46,938)