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Principles of Consolidation - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 partnership transaction entity | Dec. 31, 2023 transaction | Sep. 30, 2021 transaction | Dec. 31, 2023 transaction | Dec. 31, 2021 transaction | Dec. 31, 2018 partnership
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of partnerships consolidated | 2 |  |  |  |  | 2
Number of securitization transactions co-sponsored | transaction | 2 | 2 | 2 | 2 | 2 |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of partnerships consolidated | 2 |  |  |  |  |
VIE, ownership interest rate (as a percent) | 80.00% |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | Servicing Investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of partnerships consolidated | 2 |  |  |  |  |
VIE, ownership interest rate (as a percent) | 80.00% |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of securitization entities to which asset transferred (in entities) | entity | 46 |  |  |  |  |

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