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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
--- | --- | ---
Mar. 31, 2021 | Feb. 28, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Share issuances: |  |  |  |
Treasury stock repurchases | (3,000) | (962,000) | (965,000) |
Class A Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares outstanding at beginning of period |  |  | 323,018,000 | 307,915,000
Share issuances: |  |  |  |
Redemptions/Exchanges of limited partnership interests |  |  | 10,430,945 | 2,105,401
Vesting of RSUs |  |  | 1,367,000 | 697,000
Acquisitions |  |  | 251,000 | 270,000
Other issuances of BGC Class A common stock |  |  | 262,000 | 72,000
Treasury stock repurchases |  |  | (964,471) | 0
Shares outstanding at end of period | 334,364,000 |  | 334,364,000 | 311,059,000

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