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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) - shares | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 | Nov. 30, 2023 | Oct. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share issuances: |  |  |  |  |  |  |  |  |  |  |  |  |
Redemptions/exchanges of limited partnership interests (in shares) |  |  |  |  |  |  |  |  |  |  | 29,118,664 | 30,998,136 | 58,024,858
Restricted stock awards |  |  |  |  |  |  |  |  |  |  | 38,610,233 | 0 |
Forfeitures of restricted BGC Class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (1,400,000) | (100,000) |
Treasury stock repurchases (in shares) | 0 | (1,204,000) | (4,269,000) | (8,087,000) | (9,814,000) | (846,000) | (5,945,000) | (12,397,000) | (8,745,000) | 0 | (24,220,000) | (27,087,000) |
Contingent restricted stock awards (in shares) |  |  |  |  |  |  |  |  |  |  | 22,400,000 |  |
Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuances: |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 400,000 |  |
Number of units redeemed and cancelled for exchange (in shares) |  |  |  |  |  |  |  |  |  |  | 26,400,000 | 21,400,000 |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding at beginning of period (in shares) |  |  |  |  |  | 325,858,000 |  |  |  | 317,023,000 | 325,858,000 | 317,023,000 |
Share issuances: |  |  |  |  |  |  |  |  |  |  |  |  |
Redemptions/exchanges of limited partnership interests (in shares) |  |  |  |  |  |  |  |  |  |  | 30,754,000 | 30,998,000 |
Vesting of RSUs (in shares) |  |  |  |  |  |  |  |  |  |  | 13,009,000 | 3,284,000 |
Acquisitions (in shares) |  |  |  |  |  |  |  |  |  |  | 4,566,000 | 1,206,000 |
Other issuances of BGC Class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 2,946,000 | 501,000 |
Forfeitures of restricted BGC Class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (1,428,000) | (67,000) |
Treasury stock repurchases (in shares) |  |  |  |  |  |  |  |  |  |  | (23,250,551) | (27,086,884) | (68,253,498)
Shares outstanding at end of period (in shares) | 390,095,000 |  |  |  |  |  | 325,858,000 |  |  |  | 390,095,000 | 325,858,000 | 317,023,000
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 20,500,000 | 20,900,000 |

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