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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
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share issuances: |  |  |  |
Redemptions/exchanges of limited partnership interests (in shares) | 5,064,529 | 30,155,970 | 11,707,619 | 40,586,915
Restricted stock forfeitures (in shares) | (4,000) | (100,000) | (4,000) | (100,000)
Treasury stock repurchases (in shares) | (8,745,000) | (16,543,000) | (8,745,000) | (17,507,000)
Class A Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares outstanding at beginning of period (in shares) | 326,563,000 | 334,364,000 | 317,023,000 | 323,018,000
Share issuances: |  |  |  |
Redemptions/exchanges of limited partnership interests (in shares) | 5,071,000 | 30,156,000 | 11,714,000 | 40,587,000
Vesting of RSUs (in shares) | 589,000 | 360,000 | 2,571,000 | 1,728,000
Acquisitions (in shares) | 274,000 | 537,000 | 1,186,000 | 787,000
Other issuances of BGC class A common stock (in shares) | 339,000 | 5,000 | 342,000 | 266,000
Restricted stock forfeitures (in shares) | (4,419) | (84,000) | (4,419) | (83,765)
Treasury stock repurchases (in shares) | (8,745,310) | (16,542,535) | (8,745,310) | (17,507,006)
Shares outstanding at end of period (in shares) | 324,087,000 | 348,795,000 | 324,087,000 | 348,795,000

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