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Long-Term Debt - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Jun. 30, 2025 USD ($) renewalPeriod | Sep. 30, 2025 USD ($) extensionTerm Rate | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) extensionTerm renewalPeriod Rate | Sep. 30, 2024 USD ($) | Jun. 17, 2025 USD ($) | Dec. 31, 2024 USD ($) | Apr. 17, 2023 USD ($) | Feb. 16, 2023 USD ($) | Jun. 05, 2019 USD ($) tranche
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 594,000,000 | $ 0 |  |  |  |  |
Debt instrument, repurchase program, maximum amount |  |  |  |  |  |  |  |  | $ 100,000,000 |
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 | Rate |  | 310.00% |  | 310.00% |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 12,400,000 |  | $ 12,400,000 |  |  | $ 7,400,000 |  |  |
Gain (loss) on extinguishment of debt |  | $ 0 | $ 0 | $ (850,000) | 0 |  |  |  |  |
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 | tranche |  |  |  |  |  |  |  |  |  | 2
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  |  |  |  |  |  |  |  |  | 4.194%
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 700,000,000
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  | 4.723% |  | 4.723% |  |  | 4.723% |  |  | 4.723%
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 600,000,000
Amortization of debt issuance costs |  | $ 0 |  | $ 400,000 |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | (900,000) |  |  |  |  |  |
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 594,000,000 |  |  |  |  |  |
Amortization of debt issuance costs |  |  | 200,000 |  | 700,000 |  |  |  |  |
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  | 7.824% |  | 7.824% |  |  | 7.824% | 7.824% |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 500,000,000 |  |
Debt instrument, term (in years) |  |  |  | 10 years |  |  |  |  |  |
Additional interest on fixed rate (in percent) |  |  |  | 5.00% |  |  |  |  |  |
Quarterly principal payment |  |  |  | $ 1,250,000 |  |  |  |  |  |
Covenant compliance, leverage ratio, maximum | Rate |  | 525.00% |  | 525.00% |  |  |  |  |  |
Ratio of indebtedness to net capital | Rate |  | 458.00% |  | 458.00% |  |  |  |  |  |
Make-whole premium |  | $ 20,900,000 |  | $ 20,900,000 |  |  |  |  |  |
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 (in percent) |  |  |  | 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 |  | 300,000 | 300,000 | 900,000 | 800,000 |  |  |  |  |
Debt issuance costs, net |  | $ 5,300,000 |  | $ 5,300,000 |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 7.14% at December 31, 2024 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  |  |  |  |  |  | 7.14% |  |  |
Series 2022-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 7.14% at December 31, 2024 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, expired amount |  |  |  |  |  | $ 325,000,000 |  |  |  |
Series 2025-1 6.720% Fixed Rate Senior Secured Notes, Class A-2 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  | 6.72% |  | 6.72% |  | 6.72% | 6.72% |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 600,000,000 |  |  |  |
Debt instrument, term (in years) |  |  |  | 10 years |  |  |  |  |  |
Additional interest on fixed rate (in percent) |  |  |  | 5.00% |  |  |  |  |  |
Quarterly principal payment |  |  |  | $ 1,500,000 |  |  |  |  |  |
Covenant compliance, leverage ratio, maximum | Rate |  | 525.00% |  | 525.00% |  |  |  |  |  |
Ratio of indebtedness to net capital | Rate |  | 458.00% |  | 458.00% |  |  |  |  |  |
Make-whole premium |  | $ 40,600,000 |  | $ 40,600,000 |  |  |  |  |  |
Annual principal payment |  | 6,000,000 |  | $ 6,000,000 |  |  |  |  |  |
Series 2025-1 6.720% Fixed Rate Senior Secured Notes, Class A-2 | Ten Year United States Treasury Bill Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest on fixed rate (in percent) |  |  |  | 7.85% |  |  |  |  |  |
Series 2025-1 6.720% Fixed Rate Senior Secured Notes, Class A-2 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance costs, gross |  | 7,500,000 |  | $ 7,500,000 |  |  |  |  |  |
Amortization of debt issuance costs |  | 300,000 |  | 400,000 |  |  |  |  |  |
Debt issuance costs, net |  | $ 7,100,000 |  | $ 7,100,000 |  |  |  |  |  |
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  | 6.56% |  | 6.56% |  |  |  |  |  |
Number of additional extensions | extensionTerm |  | 2 |  | 2 |  |  |  |  |  |
Additional extension (in years) |  |  |  | 1 year |  |  |  |  |  |
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 325,000,000 |  |  |  |  | $ 325,000,000 |  |  |  |
Number of renewal periods | renewalPeriod | 2 |  |  | 2 |  |  |  |  |  |
Renewal period term (in years) | 1 year |  |  | 1 year |  |  |  |  |  |
Interest rate after renewal date (in percent) | 5.00% |  |  |  |  |  |  |  |  |
Debt, weighted average interest rate (in percent) |  | 6.85% |  | 6.85% |  |  |  |  |  |
Letters of credit outstanding, amount |  | $ 600,000 |  | $ 600,000 |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  | 224,400,000 |  | 224,400,000 |  |  |  |  |  |
Debt issuance costs, gross | $ 4,100,000 |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  | 300,000 | $ 300,000 | 900,000 | $ 900,000 |  |  |  |  |
Debt issuance costs, net |  | $ 6,600,000 |  | 6,600,000 |  |  |  |  |  |
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 2.50% |  |  |  |  |  |  |  |  |
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  | $ 100,000,000 |  |  |  |  |  |
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Letter of Credit | Base Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 2.00% |  |  |  |  |  |  |  |  |
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Letter of Credit | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 0.50% |  |  |  |  |  |  |  |  |
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Letter of Credit | Federal Funds Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 0.50% |  |  |  |  |  |  |  |  |

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