Indebtedness - Schedule of Debt (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total debt, net	$ 11,148,061	$ 10,671,928
Unused borrowing capacity	49,800
Securitized loans
Debt Instrument [Line Items]
Total debt, net	907,800
Recourse debt
Debt Instrument [Line Items]
Total debt, gross	1,064,667	937,144
Unamortized debt discount	(14,884)	(4,775)
Total debt, net	1,049,783	932,369
Unused borrowing capacity	0
Recourse debt | Bank Line Of Credit
Debt Instrument [Line Items]
Total debt, gross	387,002	$ 539,502
Unused borrowing capacity	$ 0
Weighted average interest rate	9.32%	8.89%
Recourse debt | Bank Line Of Credit | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate during period	3.25%
Recourse debt | Bank Line Of Credit | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Interest rate during period	3.75%
Recourse debt | Bank Line Of Credit | Federal Funds Rate
Debt Instrument [Line Items]
Interest rate	0.50%
Recourse debt | Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Total debt, gross	$ 194,478	$ 397,642
Unused borrowing capacity	$ 0
Weighted average interest rate	0.00%	0.00%
Recourse debt | Convertible Senior Notes Due 2026 | Minimum
Debt Instrument [Line Items]
Interest rate during period	0.00%
Recourse debt | Convertible Senior Notes Due 2030
Debt Instrument [Line Items]
Total debt, gross	$ 483,187	$ 0
Unused borrowing capacity	$ 0
Weighted average interest rate	4.00%	0.00%
Recourse debt | Convertible Senior Notes Due 2030 | Minimum
Debt Instrument [Line Items]
Interest rate during period	4.00%
Recourse debt | Line of Credit | Base Rate | Minimum
Debt Instrument [Line Items]
Interest rate	2.25%
Recourse debt | Line of Credit | Base Rate | Maximum
Debt Instrument [Line Items]
Interest rate	2.75%
Non Recourse Debt
Debt Instrument [Line Items]
Total debt, gross	$ 10,186,380	$ 9,820,130
Total debt, net	10,098,278	9,739,559
Unused borrowing capacity	49,800
Non Recourse Debt | Senior revolving and delayed draw loans
Debt Instrument [Line Items]
Total debt, gross	1,826,800	$ 1,886,300
Unused borrowing capacity	$ 49,800
Weighted average interest rate	7.98%	7.59%
Non Recourse Debt | Senior revolving and delayed draw loans | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate during period	2.35%
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	$ 2,568,240	$ 2,226,343
Unused borrowing capacity	$ 0
Weighted average interest rate	6.98%	7.07%
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	1.85%
Non Recourse Debt | Senior non-revolving loans | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Interest rate during period	2.65%
Non Recourse Debt | Subordinated revolving and delayed draw loans
Debt Instrument [Line Items]
Total debt, gross	$ 181,550	$ 146,000
Unused borrowing capacity	$ 0
Weighted average interest rate	11.45%	12.01%
Non Recourse Debt | Subordinated revolving and delayed draw loans | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate during period	3.76%
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	$ 2,245,740	$ 2,110,693
Total debt, net	143,700
Unused borrowing capacity	$ 0
Weighted average interest rate	9.23%	9.18%
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	6.90%
Non Recourse Debt | Subordinated Loans | Floating Rate
Debt Instrument [Line Items]
Total debt, net	$ 468,500
Non Recourse Debt | Securitized loans
Debt Instrument [Line Items]
Total debt, gross	3,364,050	$ 3,450,794
Unused borrowing capacity	$ 0
Weighted average interest rate	4.62%	4.61%
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%
Non Recourse Debt | 0% Convertible Senior Notes
Debt Instrument [Line Items]
Total debt, net	$ 194,500
Unamortized debt (discount) premium, net
Debt Instrument [Line Items]
Unamortized debt (discount) premium, net	(88,102)	$ (80,571)
Unused borrowing capacity	$ 0
Line of Credit | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate	3.25%
Line of Credit | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Interest rate	3.75%
Convertible Debt | Convertible Senior Notes Due 2030
Debt Instrument [Line Items]
Conversion price (in dollars per share)	$ 0.0613704
Convertible Debt | 0% Convertible Senior Notes
Debt Instrument [Line Items]
Total debt, net	$ 483,200
Interest rate	4.00%
Conversion price (in dollars per share)	$ 117.91
Convertible Debt | 0% Convertible Senior Notes | Base Rate
Debt Instrument [Line Items]
Conversion price (in dollars per share)	$ 16.29