Long-Term Debt - Narrative (Details)			1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 17, 2023 USD ($)	Jun. 05, 2019 USD ($) extensionTerm	Aug. 31, 2022 USD ($) renewalPeriod	Jun. 30, 2023 USD ($) extensionTerm Rate	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) extensionTerm Rate	Jun. 30, 2022 USD ($)	Feb. 16, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 12, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Repayments of long-term debt						$ 651,713,000	$ 0
Debt Instrument, Repurchase Program, Maximum Amount								$ 100,000,000
Threshold percentage				50.00%		50.00%
Cash sweeping event | Rate				175.00%		175.00%
Rapid amortization event | Rate				120.00%		120.00%
Manager termination event | Rate				120.00%		120.00%
Interest-only debt service coverage ratio, default event | Rate				110.00%		110.00%
Debt service coverage ratio				3.7		3.7
Gain (loss) on extinguishment of debt				$ (1,671,000)	$ 0	$ (10,000)	0
Unamortized debt issuance costs				$ 10,500,000		$ 10,500,000			$ 5,100,000
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I
Debt Instrument [Line Items]
Debt instrument, face amount		$ 700,000,000
Debt interest rate (percent)		4.194%		4.194%		4.194%			4.194%
Repayments of long-term debt	$ 585,000,000
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II and Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I
Debt Instrument [Line Items]
Number of tranches issued | extensionTerm		2
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II
Debt Instrument [Line Items]
Debt instrument, face amount		$ 600,000,000
Debt interest rate (percent)		4.723%		4.723%		4.723%			4.723%
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II | Ten Year United States Treasury Bill Rate
Debt Instrument [Line Items]
Additional interest on fixed rate		7.64%
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.70% and 7.29% at June 30, 2023 and December 31, 2022, respectively
Debt Instrument [Line Items]
Debt interest rate (percent)				7.70%		7.70%			7.29%
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.70% and 7.29% at June 30, 2023 and December 31, 2022, respectively | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 325,000,000							$ 325,000,000
Line of credit facility, amount outstanding				$ 100,000,000		$ 100,000,000
Number of renewal periods | renewalPeriod			2
Renewal period term (in years)			1 year
Interest rate percentage after renewal date						5.00%
Letters of credit outstanding, amount				3,400,000		$ 3,400,000
Line of credit facility, current borrowing capacity				$ 221,600,000		$ 221,600,000
Debt, weighted average interest rate				7.46%		7.46%
Debt issuance costs, gross			$ 6,300,000
Amortization of debt issuance costs				$ 300,000		$ 600,000
Debt issuance costs, net				$ 5,300,000		$ 5,300,000
Number of additional extensions | extensionTerm				2		2
Additional extension (in years)						1 year
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.70% and 7.29% at June 30, 2023 and December 31, 2022, respectively | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate			2.50%
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.70% and 7.29% at June 30, 2023 and December 31, 2022, respectively | Letter of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.70% and 7.29% at June 30, 2023 and December 31, 2022, respectively | Letter of Credit | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.70% and 7.29% at June 30, 2023 and December 31, 2022, respectively | Letter of Credit | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate			2.00%
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.70% and 7.29% at June 30, 2023 and December 31, 2022, respectively | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 225,000,000		$ 225,000,000
Line of credit facility, expired amount										$ 225,000,000
Line of credit facility, amount outstanding											$ 0
Amortization of debt issuance costs							200,000
Gain (loss) on extinguishment of debt						$ (1,200,000)
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.70% and 7.29% at June 30, 2023 and December 31, 2022, respectively | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate						2.15%
Line of credit facility, percentage of advances drawn						60.00%
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.70% and 7.29% at June 30, 2023 and December 31, 2022, respectively | Revolving Credit Facility | Commercial Paper Funding Rate Of Conduit Investor
Debt Instrument [Line Items]
Basis spread on variable rate						2.15%
Line of credit facility, percentage of advances drawn						40.00%
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2
Debt Instrument [Line Items]
Debt instrument, face amount	$ 500,000,000
Debt interest rate (percent)	7.824%			7.824%		7.824%
Additional interest on fixed rate	5.00%
Debt instrument, term	10 years
Quarterly principal payment						$ 1,250,000
Covenant compliance, leverage ratio, maximum | Rate				525.00%		525.00%
Ratio of indebtedness to net capital | Rate				450.00%		450.00%
Make-whole premium				$ 45,100,000		$ 45,100,000
Annual principal payment				5,000,000		5,000,000
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2 | Ten Year United States Treasury Bill Rate
Debt Instrument [Line Items]
Additional interest on fixed rate	9.24%
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2 | Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs, gross				8,000,000		8,000,000
Amortization of debt issuance costs				200,000		200,000
Debt issuance costs, net				$ 7,800,000		7,800,000
2019 Class A-2-I And 2019 Class A-2-II Notes
Debt Instrument [Line Items]
Additional interest on fixed rate		5.00%
Debt instrument, term		10 years
Quarterly principal payment						$ 1,500,000
Covenant compliance, leverage ratio, maximum | Rate				525.00%		525.00%
Ratio of indebtedness to net capital | Rate				450.00%		450.00%
Debt issuance costs, gross				$ 12,900,000		$ 12,900,000
Amortization of debt issuance costs				200,000	$ 100,000	1,100,000	$ 1,100,000
Gain (loss) on extinguishment of debt						(1,700,000)
Unamortized debt issuance costs				2,700,000		2,700,000
Annual principal payment				$ 6,000,000		6,000,000
Class A-2-I Notes | Revolving Credit Facility
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (1,700,000)					1,700,000
Extinguishment of debt						$ 67,900,000