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Subsequent Events (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 22, 2025 | Oct. 06, 2025 | May 19, 2025 | May 16, 2025 | Sep. 30, 2025 | Aug. 31, 2025 | Jul. 31, 2025 | Sep. 30, 2024 | Aug. 31, 2024 | Jul. 31, 2024 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Nov. 05, 2025
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  | 2,225,000 | 2,014,000 | 0 | 1,046,000 | 4,807,000 | 2,040,000 | 4,239,000 | 17,224,000 | 3,184,000 | 7,893,000 | 10,688,000 | 11,250,000 | 24,647,000 | 29,831,000 |
Payment to purchase equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 3,699,000 |
BGC Group 6.150% Senior Notes due April 2, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 6.15% |  |  |  |  |  | 6.15% |  |  |  |  |  | 6.15% |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to purchase equity securities | $ 20,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Purchaser Trusts | Mr. Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares held by related party, value of shares sold |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Certain other Trusts Controlled by Mr. Brandon G. Lutnick | Mr. Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares held by related party, value of shares sold |  | $ 13,096,795.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.02
Class B Common Stock | Subsequent Event | Cantor | Mr. Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares held by related party, number of shares sold (in shares) |  | 8,973,721 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares held by related party, shares sold, price per share (in dollars per share) |  | $ 9.2082 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share, after tax (in dollars per share) |  | $ 0.032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 4,236,069 |  |  | 7,013,116 |  |  | 22,808,205 | 26,264,523 |
Class A Common Stock | Mr. Howard W. Lutnick | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  | 16,115,102 | 16,452,850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Subsequent Event | Mr. Howard W. Lutnick | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  | 337,765 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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