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Related Party Transactions - Other Transactions (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 15, 2022 | Feb. 25, 2021
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Receivables from related parties |  | $ 5,458,000 |  | $ 5,458,000 |  | $ 2,717,000 |  |  |
Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest income |  | 4,400,000 | $ 2,000,000.0 | 10,200,000 | $ 5,900,000 |  |  |  |
Due from related parties, write-offs |  |  |  |  |  |  | $ 600,000 |  |
Receivables from related parties |  |  |  |  |  | $ 400,000 |  |  |
Related Party | Subordinated Loan Agreement with Aqua |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest income | $ 0 |  |  |  |  |  |  |  |
Aqua | Cantor | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  |  | 51.00%
Aqua | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Increase in authorization amount for loans and investments, other credit support arrangements |  |  |  |  |  |  |  | $ 1,000,000.0 | $ 1,000,000.0
Authorization amount for loans and investments, other credit support arrangements |  |  |  |  |  |  |  |  | $ 21,200,000
Aqua | Related Party | Subordinated Loan Agreement with Aqua |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Receivables from related parties |  | $ 1,000,000.0 |  | $ 1,000,000.0 |  |  |  |  |
Aqua | Aqua | BGC Partners, Inc. | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  | 49.00%

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