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Limited Partnership Interests in BGC Holdings and Newmark Holdings - Narrative (Detail) |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 01, 2023 shares | Mar. 31, 2024 installment partnership | Jun. 05, 2015
Related Party Transaction [Line Items] |  |  |
Number of operating partnerships | partnership |  | 2 |
Conversion of stock, shares converted (in shares) | 64,000,000 |  |
Minimum number of shares required to be issued (in shares) | 75,000,000 |  |
Limited partnership interest, conversion ratio |  |  | 1
Number of installments | installment |  | 4 |
LPUs |  |  |
Related Party Transaction [Line Items] |  |  |
Limited partnership interests exchange ratio |  | 0.9255 |
Newmark Holdings |  |  |
Related Party Transaction [Line Items] |  |  |
Calculation of contribution ratio, denominator |  | 2.2 |
Limited partnership interest, conversion ratio |  | 1 |
Percentage of preferred partnership units awarded |  | 0.6875% |
Percentage of preferred partnership units awarded per calendar year |  | 2.75% |
BGC Holdings |  |  |
Related Party Transaction [Line Items] |  |  |
Limited partnership interest, conversion ratio |  | 1 |
Percentage of preferred partnership units awarded |  | 0.6875% |
Percentage of preferred partnership units awarded per calendar year |  | 2.75% |

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