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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 | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | May 31, 2021 | Apr. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share issuances: |  |  |  |  |  |  |  |
Redemptions/Exchanges of limited partnership interests (in shares) |  |  |  | 30,155,970 |  | 1,968,788 | 40,586,915 | 4,074,189
Restricted stock forfeitures (in shares) |  |  |  | (84,000) |  | 0 | (84,000) | 0
Treasury stock repurchases (in shares) | (15,522,000) | (1,018,000) | (2,000) |  | (965,000) |  | (17,507,000) |
Class A Common Stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Shares outstanding at beginning of period (in shares) |  |  | 334,364,000 | 334,364,000 | 323,018,000 | 311,059,000 | 323,018,000 | 307,915,000
Share issuances: |  |  |  |  |  |  |  |
Redemptions/Exchanges of limited partnership interests (in shares) |  |  |  | 30,156,000 |  | 1,969,000 | 40,587,000 | 4,074,000
Vesting of RSUs (in shares) |  |  |  | 360,000 |  | 103,000 | 1,728,000 | 800,000
Acquisitions (in shares) |  |  |  | 537,000 |  | 15,000 | 787,000 | 285,000
Other issuances of BGC Class A common stock (in shares) |  |  |  | 5,000 |  | 177,000 | 266,000 | 249,000
Restricted stock forfeitures (in shares) |  |  |  | (83,765) |  | 0 | (83,765) | 0
Treasury stock repurchases (in shares) |  |  |  | (16,542,535) |  | 0 | (17,507,006) | 0
Shares outstanding at end of period (in shares) | 348,795,000 |  |  | 348,795,000 | 334,364,000 | 313,323,000 | 348,795,000 | 313,323,000

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