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Stock Transactions and Unit Redemptions - Gross Unit Redemptions and Share Repurchases of Class A Common Stock Table Footnote (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Class of Stock [Line Items] |  |  |
Aggregate purchase price of Class A common stock | $ 262,211 | $ 114,580 | $ 103,888
Shares withheld to satisfy tax liabilities (in shares) |  | 1.0 |
Shares withheld for tax withholding obligation (dollars per share) |  | $ 5.21 |
Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Repurchase of Class A shares including shares withheld for RSAs (in shares) | 36.2 |  |
Aggregate purchase price of Class A common stock | $ 300,500 | $ 119,600 |
Weighted-average price of Class A common stock (in dollars per share) | $ 8.30 | $ 4.94 |
Share-based payment arrangement, decrease for tax withholding obligation | $ 41,000 | $ 3,900 |
Cantor units converted into shares of BGC Group Class B common stock due to the Corporate Conversion (in shares) | 1.8 | 20.5 |
Common stock, shares issued for exchange of units (in shares) |  | 13.6 |
Number of shares repurchased (in shares) |  | 24.2 |
Restricted Shares |  |  |
Class of Stock [Line Items] |  |  |
Shares withheld to satisfy tax liabilities (in shares) | 4.6 |  |
Share-based payment arrangement, decrease for tax withholding obligation | $ 38,400 | $ 5,000 |
Shares withheld for tax withholding obligation (dollars per share) | $ 8.35 |  |
Limited Partnership |  |  |
Class of Stock [Line Items] |  |  |
Redeemed limited partnership units (in shares) |  | 0.3 |
Aggregate redemption price of limited partnership units |  | $ 1,400 |
Weighted-average price for redemption of limited partnership units (in dollars per shares) |  | $ 4.71 |
Cantor units converted into shares of BGC Group Class B common stock due to the Corporate Conversion (in shares) | 1.8 | 0.4 |
Other Ownership Interest |  |  |
Class of Stock [Line Items] |  |  |
Redeemed limited partnership units (in shares) |  | 0.2 |
Aggregate redemption price of limited partnership units |  | $ 800 |
Weighted-average price for redemption of limited partnership units (in dollars per shares) |  | $ 5.11 |

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