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Compensation - Summary of the BGC Holdings and Newmark Holdings LPUs held by BGC Employees (Detail) - LPUs - shares | Jun. 30, 2022 | Dec. 31, 2021
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 105,708,000 | 112,115,000
Newmark |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 10,355,000 | 11,051,000
Regular Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 74,469,000 |
Regular Units | Newmark |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 7,888,000 |
Preferred Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 31,239,000 |
Preferred Units | Newmark |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Balance outstanding (in shares) | 2,467,000 |

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