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Long-Term Debt - Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Aug. 31, 2022 USD ($) renewalPeriod | Dec. 31, 2022 USD ($) | Dec. 31, 2024 USD ($) extensionTerm renewalPeriod Rate | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Apr. 17, 2023 USD ($) | Feb. 16, 2023 USD ($) | Aug. 12, 2022 USD ($) | Mar. 31, 2021 USD ($) | Jun. 05, 2019 USD ($) tranche
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 0 | $ 651,713,000 | $ 38,768,000 |  |  |  |  |
Debt repurchase program, maximum amount authorized |  |  |  |  |  |  | $ 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 | Rate |  |  | 340.00% |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ 0 | $ (10,000) | 210,000 |  |  |  |  |
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 | 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%
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 600,000,000
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.14% and 7.95% at December 31, 2024 and December 31, 2023, respectively |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  |  | 7.14% | 7.95% |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.14% and 7.95% at December 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 |  |
Number of renewal periods | renewalPeriod | 2 |  | 2 |  |  |  |  |  |  |
Renewal period term (in years) | 1 year |  | 1 year |  |  |  |  |  |  |
Interest rate percentage after renewal date |  |  | 5.00% |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  | $ 100,000,000 |  |  |  |  |  |  |
Letters of credit outstanding |  |  | 600,000 |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  | $ 224,400,000 |  |  |  |  |  |  |
Debt, weighted average interest rate (in percent) |  |  | 7.78% |  |  |  |  |  |  |
Debt issuance costs, gross | $ 6,300,000 |  |  |  |  |  |  |  |  |
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 7.14% and 7.95% at December 31, 2024 and December 31, 2023, respectively | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 2.50% |  |  |  |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.14% and 7.95% at December 31, 2024 and December 31, 2023, respectively | Letter of Credit | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 0.50% |  |  |  |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.14% and 7.95% at December 31, 2024 and December 31, 2023, respectively | Letter of Credit | Federal Funds Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 0.50% |  |  |  |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.14% and 7.95% at December 31, 2024 and December 31, 2023, respectively | Letter of Credit | Base Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) | 2.00% |  |  |  |  |  |  |  |  |
Series 2019-1 Variable Funding Senior Notes Class A-1 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 225,000,000 |  |  |  |  |  |  |  |  |
Line of credit facility, expired amount |  |  |  |  |  |  |  | $ 225,000,000 |  |
Line of credit facility, amount outstanding |  |  |  |  |  |  |  |  | $ 0 |
Amortization costs |  |  |  |  | 400,000 |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | (1,200,000) |  |  |  |  |
Series 2019-1 Variable Funding Senior Notes Class A-1 | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  | 2.15% |  |  |  |  |  |  |
Line of credit facility, percentage of advances drawn |  |  | 60.00% |  |  |  |  |  |  |
Series 2019-1 Variable Funding Senior Notes Class A-1 | Revolving Credit Facility | Commercial Paper Funding Rate Of Conduit Investor |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  | 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 interest rate (in percent) |  |  | 7.824% |  |  | 7.824% |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 500,000,000 |  |  |  |
Additional interest on fixed rate (in percent) |  |  | 5.00% |  |  |  |  |  |  |
Debt instrument, term (in years) |  |  | 10 years |  |  |  |  |  |  |
Debt instrument, periodic payment, principal |  |  | $ 1,250,000 |  |  |  |  |  |  |
Covenant compliance, leverage ratio, maximum | Rate |  |  | 525.00% |  |  |  |  |  |  |
Ratio of indebtedness to net capital | Rate |  |  | 410.00% |  |  |  |  |  |  |
Debt instrument, make-whole premium |  |  | $ 28,000,000.0 |  |  |  |  |  |  |
Debt instrument, 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 (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 |  |  |  |  |  |  |
Amortization costs |  |  | 1,100,000 | $ 700,000 |  |  |  |  |  |
Debt issuance costs, net |  |  | $ 6,200,000 |  |  |  |  |  |  |
Class A-2-I Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | 585,100,000 |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | (1,700,000) |  |  |  |  |  |
2019 Class A-2 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest on fixed rate (in percent) |  |  | 5.00% |  |  |  |  |  |  |
Debt instrument, term (in years) |  |  | 10 years |  |  |  |  |  |  |
Debt instrument, periodic payment, principal |  |  | $ 1,500,000 |  |  |  |  |  |  |
Covenant compliance, leverage ratio, maximum | Rate |  |  | 525.00% |  |  |  |  |  |  |
Ratio of indebtedness to net capital | Rate |  |  | 410.00% |  |  |  |  |  |  |
Debt issuance costs, gross |  |  | $ 12,900,000 |  |  |  |  |  |  |
Amortization costs |  |  | 1,000,000.0 | 1,600,000 | 2,400,000 |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | 1,700,000 | 1,400,000 |  |  |  |  |
Extinguishment of debt |  | $ 40,000,000 |  | 67,900,000 |  |  |  |  |  |
Debt instrument, annual principal payment |  |  | $ 6,000,000 |  |  |  |  |  |  |
2019 Class A-2 Notes | Ten Year United States Treasury Bill Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional interest on fixed rate (in percent) |  |  | 7.64% |  |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Notes Class A-1 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization costs |  |  | $ 1,200,000 | $ 1,200,000 | $ 400,000 |  |  |  |  |
Debt issuance costs, net |  |  | 3,400,000 |  |  |  |  |  |  |
2019 Class A-2-II Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  | $ 1,300,000 |  |  |  |  |  |  |

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