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Compensation - Summary of the BGC Holdings and Newmark Holdings LPUs held by BGC Employees (Detail) - LPUs - shares | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 112,115,000 | 137,652,000 | 102,407,000 | 79,729,000
Newmark |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 11,051,000 | 13,202,000 | 14,607,000 | 22,113,000
Regular Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 77,610,000 |  |  |
Regular Units | Newmark |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 8,316,000 |  |  |
Preferred Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 34,505,000 |  |  |
Preferred Units | Newmark |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units, balance outstanding (in shares) | 2,735,000 |  |  |

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