Indebtedness - Schedule of Debt (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2024	Feb. 29, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total debt, net	$ 12,452,159		$ 10,671,928
Unused borrowing capacity	162,700
Securitized loans
Debt Instrument [Line Items]
Total debt, net	895,500
Recourse debt
Debt Instrument [Line Items]
Total debt, gross	1,008,939		937,144
Unamortized debt discount	(12,905)		(4,775)
Total debt, net	996,034		932,369
Unused borrowing capacity	0
Recourse debt | Bank Line Of Credit
Debt Instrument [Line Items]
Total debt, gross	392,524		$ 539,502
Unused borrowing capacity	$ 0
Weighted average interest rate	9.01%		8.89%
Line of credit, maximum borrowing capacity		$ 447,500
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	$ 133,228		$ 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	$ 11,578,898		$ 9,820,130
Total debt, net	11,456,125		9,739,559
Unused borrowing capacity	162,700
Non Recourse Debt | Senior revolving and delayed draw loans
Debt Instrument [Line Items]
Total debt, gross	1,779,300		$ 1,886,300
Unused borrowing capacity	$ 162,700
Weighted average interest rate	7.91%		7.59%
Line of credit, maximum borrowing capacity	$ 2,800,000
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	$ 2,357,004		$ 2,226,343
Unused borrowing capacity	$ 0
Weighted average interest rate	6.89%		6.26%
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	2.25%
Non Recourse Debt | Subordinated revolving and delayed draw loans
Debt Instrument [Line Items]
Total debt, gross	$ 25,350		$ 146,000
Unused borrowing capacity	$ 0
Weighted average interest rate	14.27%		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	9.10%
Non Recourse Debt | Subordinated Loans
Debt Instrument [Line Items]
Total debt, gross	$ 2,660,026		$ 2,110,693
Total debt, net	149,300
Unused borrowing capacity	$ 0
Weighted average interest rate	9.51%		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	10.75%
Non Recourse Debt | Subordinated Loans | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Interest rate during period	6.50%
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	$ 637,700
Non Recourse Debt | Securitized loans
Debt Instrument [Line Items]
Total debt, gross	4,757,218		$ 3,450,794
Unused borrowing capacity	$ 0
Weighted average interest rate	5.08%		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	$ 133,200
Unamortized debt (discount) premium, net
Debt Instrument [Line Items]
Unamortized debt (discount) premium, net	(122,773)		$ (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