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Related Party Transactions - Other Transactions (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2023 | Nov. 04, 2016 | Oct. 25, 2016 | Nov. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2023 | Feb. 15, 2022 | Feb. 25, 2021 | Nov. 03, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payables to related parties |  |  |  |  |  |  | $ 8,300,000 |  |  |  |
Equity investment |  |  |  |  | $ 0 | $ 588,000 | 1,115,000 |  |  |  |
Receivables from related parties |  |  |  |  | 2,717,000 | 1,444,000 |  |  |  |  |
Total revenues |  |  |  |  | 2,025,401,000 | 1,795,302,000 | 2,015,364,000 |  |  |  |
Conversion of stock, shares converted (in shares) | 64,000,000 |  |  |  |  |  |  |  |  |  |
Minimum number of shares required to be issued (in shares) | 75,000,000 |  |  |  |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  | 15,100,000 | 7,500,000 | 10,000,000 |  |  |  |
Due from related parties, write-offs |  |  |  |  |  | 600,000 |  |  |  |  |
Receivables from related parties |  |  |  |  |  |  |  | $ 400,000 |  |  |
Total revenues |  |  |  |  | 16,000,000 | 14,700,000 | 14,900,000 |  |  |  |
Cash and collateral posted expense |  |  |  |  | $ 2,200,000 | 800,000 | $ 700,000 |  |  |  |
Related Party | Subordinated Loan Agreement with Aqua |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  | $ 0 |  |  |  |  |  |  |
Cantor | Class B Common Stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) |  |  |  |  | 93,300,000 |  |  |  |  |  |
Cantor | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) |  |  |  |  | 0 |  |  |  |  |  |
CFGM | Class B Common Stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) |  |  |  |  | 3,000,000 |  |  |  |  |  |
CFGM | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) |  |  |  |  | 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 | $ 1,000,000 |
Authorization amount for loans and investments, other credit support arrangements |  |  |  |  |  |  |  |  |  | $ 21,200,000 |
Equity investment |  |  |  |  | $ 0 | $ 600,000 |  |  |  |  |
Aqua | Related Party | Subordinated Loan Agreement with Aqua |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Receivables from related parties |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Aqua | Aqua | BGC Partners, Inc. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  | 49.00% |  |  |  |  |  |
Lucera |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  | $ 24,200,000 |  |  |  |  |  |  |  |  |
Business combination, consideration, post-closing adjustment |  | $ 4,800,000 |  |  |  |  |  |  |  |  |
Lucera | Class B Units |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  |  |  | 20.00%
Purchase of units (in shares) |  |  | 9,000 |  |  |  |  |  |  |  |
Percentage of outstanding common stock owned by parent |  | 100.00% |  |  |  |  |  |  |  |  |

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