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Long-Term Debt - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended |  |  |
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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 |  |  |

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