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Limited Partnership Interests in BGC Holdings and Newmark Holdings (Detail) shares in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 30, 2018 shares | Nov. 23, 2018 shares | Jun. 05, 2015 shares | Dec. 31, 2021 installment | Dec. 31, 2021 partnership installment
Noncontrolling Interest [Abstract] |  |  |  |  |
Number of operating partnerships | partnership |  |  |  |  | 2
Limited partnership interest, conversion ratio |  |  |  | 1 | 1
Number of installment | installment |  |  |  | 4 | 4
Quarterly Percentage to preferred units |  |  |  | 0.006875 | 0.006875
Percentage to preferred units |  |  |  |  | 2.75%
CF Group Management, Inc. |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |
Number of shares, right to exchange from Class A to Class B common stock (in shares) | shares | 23.6 | 0.7 | 34.6 |  |
Newmark Holdings |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |
Calculation of contribution ratio, denominator |  |  |  | 2.2 | 2.2
Limited partnership interest, conversion ratio |  |  |  | 1 | 1
BGC Holdings LPUs |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |
Limited partnership interest, conversion ratio |  |  |  | 1 | 1

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