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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) - shares | 3 Months Ended | 12 Months Ended
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Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share issuances: |  |  |  |  |  |  |
Redemptions/exchanges of limited partnership interests (in shares) |  |  |  |  | 58,024,858 | 13,190,311 | 15,008,431
Treasury stock repurchases (in shares) | (26,313,000) | (24,433,000) | (16,542,000) | (965,000) | (68,253,000) |  |
Forfeitures of restricted BGC Class A common stock (in shares) |  |  |  |  | (140,000) | 0 |
Class A Common Stock |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Shares outstanding at beginning of period (in shares) |  |  |  | 323,018,000 | 323,018,000 | 307,915,000 |
Share issuances: |  |  |  |  |  |  |
Redemptions/exchanges of limited partnership interests (in shares) |  |  |  |  | 58,025,000 | 13,190,000 |
Vesting of RSUs (in shares) |  |  |  |  | 2,167,000 | 1,134,000 |
Acquisitions (in shares) |  |  |  |  | 1,789,000 | 391,000 |
Other issuances of BGC Class A common stock (in shares) |  |  |  |  | 417,000 | 345,000 |
Issuances of BGC Class A Common Stock for general corporate purposes (in shares) |  |  |  |  | 0 | 45,000 |
Treasury stock repurchases (in shares) |  |  |  |  | (68,253,498) | (2,259) | (233,172)
Forfeitures of restricted BGC Class A common stock (in shares) |  |  |  |  | (140,000) | 0 |
Shares outstanding at end of period (in shares) | 317,023,000 |  |  |  | 317,023,000 | 323,018,000 | 307,915,000

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