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Limited Partnership Interests in BGC Holdings and Newmark Holdings - Narrative (Detail) |  | 3 Months Ended
--- | --- | ---
Jul. 01, 2023 shares | Mar. 31, 2025 partnership installment
Related Party Transaction [Line Items] |  |
Number of operating partnerships | partnership |  | 2
Number of installments | installment |  | 4
Conversion of stock, shares converted (in shares) | 64,000,000 |
Minimum number of shares required to be issued (in shares) | 75,000,000.0 |
LPUs |  |
Related Party Transaction [Line Items] |  |
Limited partnership interests exchange ratio |  | 0.9271
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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