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Related Party Transactions - Other Transactions (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 15, 2022 | Feb. 25, 2021
Related Party Transaction [Line Items] |  |  |  |  |  |
Receivables from related parties |  | $ 7,323,000 | $ 2,717,000 |  |  |
Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest income |  | $ 13,800,000 | 15,100,000 | $ 7,500,000 |  |
Due from related parties, write-offs |  |  |  | $ 600,000 |  |
Receivables from related parties |  |  | $ 400,000 |  |  |
Subordinated Loan Agreement with Aqua | Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest income | $ 0 |  |  |  |  |
Aqua | Cantor |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Investment ownership percentage |  | 51.00% |  |  |  |
Aqua |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Increase in authorization amount for loans and investments, other credit support arrangements |  |  |  |  | $ 1,000,000.0 |
Authorization amount for loans and investments, other credit support arrangements |  |  |  |  |  | $ 21,200,000
Aqua | Subordinated Loan Agreement with Aqua | Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Receivables from related parties |  | $ 1,000,000.0 |  |  |  |
Aqua | Aqua | BGC Partners, Inc. |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of ownership interest |  | 49.00% |  |  |  |

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