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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, 2024 | Feb. 29, 2024 | Jan. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Share issuances: |  |  |  |  |  |
Redemptions/exchanges of limited partnership interests (in shares) |  |  |  |  |  | 13,144,521
Treasury stock repurchases (in shares) | (1,055,000) | (6,586,000) | (3,609,000) |  | (11,250,000) | (846,000)
Contingent restricted stock issued (in shares) |  |  |  |  | 20,400,000 |
Limited Partnership |  |  |  |  |  |
Share issuances: |  |  |  |  |  |
Number of units redeemed and cancelled for exchange (in shares) |  |  |  |  | 400,000 | 7,300,000
Class A Common Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares outstanding at beginning of period (in shares) |  |  | 390,095,000 |  | 390,095,000 | 325,858,000
Share issuances: |  |  |  |  |  |
Redemptions/exchanges of limited partnership interests (in shares) |  |  |  |  | 364,000 | 13,145,000
Vesting of RSUs (in shares) |  |  |  |  | 3,710,000 | 2,096,000
Acquisitions (in shares) |  |  |  |  | 472,255 | 658,000
Other issuances of BGC class A common stock (in shares) |  |  |  |  | 2,379,000 | 13,000
Restricted stock forfeitures (in shares) |  |  |  |  | (636,167) | (49,201)
Treasury stock repurchases (in shares) |  |  |  | (846,000) | (9,820,280) | (845,890)
Shares outstanding at end of period (in shares) | 385,134,000 |  |  | 340,875,000 | 385,134,000 | 340,875,000
Conversion, shares issued (in shares) |  |  |  |  | 400,000 | 6,900,000

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