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Compensation - Summary of the BGC Holdings and Newmark Holdings LPUs held by BGC Employees (Detail) - LPUs - shares | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 0 | 110,348,000 | 112,115,000 | 137,652,000
Newmark |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 8,779,000 | 9,351,000 | 11,051,000 | 13,202,000
Regular Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 0 |  |  |
Regular Units | Newmark |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 6,742,000 |  |  |
Preferred Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 0 |  |  |
Preferred Units | Newmark |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 2,037,000 |  |  |

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