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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 | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Aug. 31, 2021 | Jul. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share issuances: |  |  |  |  |  |  |  |  |
Redemptions/Exchanges of limited partnership interests (in shares) |  |  |  | 8,446,093 |  |  | 1,746,526 | 49,033,008 | 5,820,715
Restricted stock forfeitures (in shares) |  |  |  | (56,000) |  |  | 0 | (140,000) | 0
Treasury stock repurchases (in shares) | (8,534,000) | (5,899,000) | (10,000,000) |  | (16,542,000) | (965,000) |  | (41,940,000) |
Class A Common Stock |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Shares outstanding at beginning of period (in shares) |  |  | 348,795,000 | 348,795,000 |  | 323,018,000 | 313,323,000 | 323,018,000 | 307,915,000
Share issuances: |  |  |  |  |  |  |  |  |
Redemptions/Exchanges of limited partnership interests (in shares) |  |  |  | 8,446,000 |  |  | 1,747,000 | 49,033,000 | 5,821,000
Vesting of RSUs (in shares) |  |  |  | 213,000 |  |  | 115,000 | 1,941,000 | 915,000
Acquisitions (in shares) |  |  |  | 343,000 |  |  | 42,000 | 1,130,000 | 327,000
Other issuances of BGC Class A common stock (in shares) |  |  |  | 100,000 |  |  | 90,000 | 366,000 | 339,000
Restricted stock forfeitures (in shares) |  |  |  | (56,423) |  |  | 0 | (140,188) | 0
Treasury stock repurchases (in shares) |  |  |  | (24,432,718) |  |  | (2,259) | (41,939,724) | (2,259)
Shares outstanding at end of period (in shares) | 333,408,000 |  |  | 333,408,000 | 348,795,000 |  | 315,315,000 | 333,408,000 | 315,315,000

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