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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share issuances: |  |  |  |
Treasury stock repurchases |  |  |  | (233,172)
Class A Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares outstanding at beginning of period | 311,059,000 | 293,382,000 | 307,915,000 | 291,475,000
Share issuances: |  |  |  |
Redemptions/Exchanges of limited partnership interests | 1,968,788 | 3,879,468 | 4,074,189 | 5,700,056
Vesting of RSUs | 103,000 | 81,000 | 800,000 | 322,000
Acquisitions | 15,000 | 481,000 | 285,000 | 499,000
Other issuances of BGC Class A common stock | 177,000 | 47,000 | 249,000 | 108,000
Treasury stock repurchases | 0 | 0 | 0 | (233,000)
Shares outstanding at end of period | 313,323,000 | 297,871,000 | 313,323,000 | 297,871,000

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