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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
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share issuances: |  |  |  |
Treasury stock repurchases | (2,000) | (2,000) |  |
Forfeitures of restricted BGC Class A common stock |  | 0 | (22,000) |
Class A Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares outstanding at beginning of period |  | 307,915,000 | 291,475,000 |
Share issuances: |  |  |  |
Redemptions/exchanges of limited partnership interests |  | 13,190,311 | 15,008,431 | 18,287,721
Vesting of RSUs |  | 1,134,000 | 435,000 |
Acquisitions |  | 391,000 | 1,039,000 |
Other issuances of BGC Class A common stock |  | 345,000 | 213,000 |
Issuance of BGC Class A common stock for general corporate purposes |  | 45,000 |  |
Treasury stock repurchases |  | (2,259) | (233,172) | (788,788)
Forfeitures of restricted BGC Class A common stock |  |  | (22,000) | (231,602)
Shares outstanding at end of period |  | 323,018,000 | 307,915,000 | 291,475,000

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