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Compensation - Summary of the BGC Holdings and Newmark Holdings LPUs Held by BGC Employees (Detail) - LPUs - Newmark - shares | Mar. 31, 2024 | Dec. 31, 2023
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 8,655,000 | 8,779,000
Regular Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 6,666,000 |
Preferred Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 1,989,000 |

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