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Limited Partnership Interests in BGC Holdings and Newmark Holdings (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 01, 2023 shares | Dec. 31, 2024 installment partnership | Jun. 05, 2015
Noncontrolling Interest [Abstract] |  |  |
Number of operating partnerships | partnership |  | 2 |
Limited partnership interest, conversion ratio |  | 1 | 1
Number of installment | installment |  | 4 |
Percentage to preferred units |  | 2.75% |
Conversion of stock, shares converted (in shares) | 64,000,000 |  |
Minimum number of shares required to be issued (in shares) | 75,000,000 |  |
Newmark | Class A Common Stock |  |  |
Noncontrolling Interest [Abstract] |  |  |
Limited partnership interests exchange ratio |  | 92.79% |
Newmark Holdings |  |  |
Noncontrolling Interest [Abstract] |  |  |
Calculation of contribution ratio, denominator |  | 2.2 |
Limited partnership interest, conversion ratio |  | 1 |
Percentage to preferred units |  | 0.6875% |
Percentage of preferred partnership units awarded per calendar year |  | 2.75% |
BGC Holdings LPUs |  |  |
Noncontrolling Interest [Abstract] |  |  |
Limited partnership interest, conversion ratio |  | 1 |
Percentage to preferred units |  | 0.6875% |
Percentage of preferred partnership units awarded per calendar year |  | 2.75% |

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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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