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Related Party Transactions - Other Transactions (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 04, 2016 | Oct. 25, 2016 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Feb. 15, 2022 | Feb. 25, 2021 | Nov. 03, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Due to related parties |  |  |  | $ 8,300,000 |  | $ 8,300,000 |  |  |
Equity investment |  |  | $ 588,000 | 1,115,000 | $ 1,458,000 |  |  |  |
Receivables from related parties |  |  | 1,444,000 | 5,237,000 |  |  |  |  |
Cantor |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Recognized related party revenues |  |  | 14,700,000 | 14,900,000 | 25,800,000 |  |  |  |
Newmark |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Due to related parties |  |  | 0 |  |  |  |  |  |
Aqua |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Interest income, related party |  |  | $ 0 |  |  |  |  |  |
Cantor | Aqua |  |  |  |  |  |  |  |  |
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 |  |  | $ 600,000 | 1,100,000 |  |  |  |  |
Receivables from related parties |  |  | $ 980,000 | 980,000 |  |  |  |  |
Loan receivable, basis spread on variable rate |  |  | 6.00% |  |  |  |  |  |
Subordinated loan, portion written off |  |  | $ 550,000 |  |  |  |  |  |
Aqua | BGC Partners, Inc. | Aqua |  |  |  |  |  |  |  |  |
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 | Cantor |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Recognized related party revenues |  |  | $ 23,200 | $ 200,000 | $ 700,000 |  |  |  |
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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