Long-Term Debt - Narrative (Details)			1 Months Ended	3 Months Ended
	Apr. 17, 2023 USD ($)	Jun. 05, 2019 USD ($) extensionTerm	Aug. 31, 2022 USD ($) renewalPeriod	Mar. 31, 2024 USD ($) extensionTerm Rate	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Feb. 16, 2023 USD ($)	Aug. 12, 2022 USD ($)
Debt Instrument [Line Items]
Repayments of long-term debt				$ 0		$ 66,574,000
Debt instrument, repurchase program, maximum amount								$ 100,000,000
Threshold percentage				50.00%
Cash sweeping event | Rate				175.00%
Rapid amortization event | Rate				120.00%
Manager termination event | Rate				120.00%
Interest-only debt service coverage ratio, default event | Rate				110.00%
Debt service coverage ratio				3.5
Gain (loss) on extinguishment of debt				$ 0		1,661,000
Unamortized debt issuance costs				$ 9,000,000.0			$ 9,500,000
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I
Debt Instrument [Line Items]
Debt interest rate (percent)		4.194%
Debt instrument, face amount		$ 700,000,000
Repayments of long-term debt	$ 585,100,000
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 interest rate (percent)		4.723%		4.723%			4.723%
Debt instrument, face amount		$ 600,000,000
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.94% and 7.95% at March 31, 2024 and December 31, 2023, respectively
Debt Instrument [Line Items]
Debt interest rate (percent)				7.94%			7.95%
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.94% and 7.95% at March 31, 2024 and December 31, 2023, 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
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
Line of credit facility, current borrowing capacity				$ 221,600,000
Debt, weighted average interest rate				7.95%
Debt issuance costs, gross			$ 6,300,000
Amortization of debt issuance costs				$ 300,000		300,000
Debt issuance costs, net				$ 4,400,000
Number of additional extensions | extensionTerm				2
Additional extension (in years)				1 year
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.94% and 7.95% at March 31, 2024 and December 31, 2023, 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 7.94% and 7.95% at March 31, 2024 and December 31, 2023, 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 7.94% and 7.95% at March 31, 2024 and December 31, 2023, 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 7.94% and 7.95% at March 31, 2024 and December 31, 2023, 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 7.94% and 7.95% at March 31, 2024 and December 31, 2023, respectively | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, expired amount									$ 225,000,000
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2
Debt Instrument [Line Items]
Debt interest rate (percent)	7.824%			7.824%			7.824%
Debt instrument, face amount	$ 500,000,000
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%
Make-whole premium				$ 35,500,000
Annual principal payment				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
Amortization of debt issuance costs				300,000
Debt issuance costs, net				7,000,000
2019 Class A-2-I And 2019 Class A-2-II Notes
Debt Instrument [Line Items]
Repayments of long-term debt					$ 585,100,000
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%
Ratio of indebtedness to net capital | Rate				430.00%
Debt issuance costs, gross				$ 12,900,000
Amortization of debt issuance costs				200,000		900,000
Gain (loss) on extinguishment of debt					$ (1,700,000)
Unamortized debt issuance costs				2,000,000
Annual principal payment				$ 6,000,000
2019 Class A-2-I And 2019 Class A-2-II Notes | Ten Year United States Treasury Bill Rate
Debt Instrument [Line Items]
Additional interest on fixed rate		7.64%
Class A-2-I Notes | Revolving Credit Facility
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt						1,700,000
Extinguishment of debt						$ 67,900,000