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Compensation - Summary of the BGC Holdings and Newmark Holdings LPUs held by BGC Employees (Detail) - LPUs - shares | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 71,594,000 | 110,347,000
Newmark |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 9,003,000 | 9,351,000
Regular Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 49,240,000 |
Regular Units | Newmark |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 6,897,000 |
Preferred Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 22,354,000 |
Preferred Units | Newmark |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 2,106,000 |

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