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Organization and Basis of Presentation - Additional Information (Detail) - USD ($) |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2023 | Jul. 01, 2023 | Jun. 30, 2023 | Jul. 30, 2021 | Oct. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation |  |  |  |  | $ 5,000,000 |  |  |  |
Share-based payment arrangement, total shares (in shares) |  |  |  |  |  | 0 |  |  |
Conversion of stock, shares converted (in shares) |  | 64,000,000 |  |  |  |  |  |  |
Minimum number of shares required to be issued (in shares) |  | 75,000,000 |  |  |  |  |  |  |
Stock Purchased On 6/30/2023 |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Conversion of stock, shares converted (in shares) |  | 5,700,000 |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Issuance of Class A common stock (net of costs) (in shares) |  |  |  |  |  |  | 0 | 0 |
Non-exchangeable Limited Partnership Interests |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  |  |  |  | $ 60,900,000 |  |  |
Exchangeable Limited Partnership Units | Related Party |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  | 1,500,000 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  | 25,300,000 |  |  |  |  |  |  |
Exchange ratio |  |  | 1 |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation |  | $ 74,000,000 | $ 49,200,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) | Related Party |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  | 16,900,000 |  |  |
Cantor Units | Related Party |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  | 324,223 |  |  |
Cantor Units | Related Party | Cantor |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  | 5,425,209 |  |  |
Aggregate consideration |  |  |  |  |  | $ 9,715,772 |  |  |
FPU | Related Party |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  | 5,425,209 |  |  |
Exchange of units (in shares) |  |  |  |  |  | 324,223 |  |  |
FPU & Cantor Units | Related Party |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Aggregate consideration |  |  |  |  |  | $ 598,712 |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  |  |  |  |  | $ 24,700,000 |  |
Restricted Shares | Maximum |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  | 38,600,000 |  |  |  |  |  |  |
Non-exchangeable FPUs | Related Party |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  | 5,600,000 |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Shares granted in period (in shares) |  | 600,000,000 |  |  |  |  |  |  |
Issuance of Class A common stock (net of costs) (in shares) |  |  |  |  |  |  | 518,191 | 500,697 | 417,247
Common stock, shares authorized (in shares) |  | 1,500,000,000 |  |  |  | 1,500,000,000 | 1,500,000,000 | 750,000,000 |
Class A Common Stock | Share-Based Payment Arrangement | Related Party |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  | 1,000,000 |  |  |
Class A Common Stock | BGC Parnters |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |  |  |
Class A Common Stock | BGC Group |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Issuance of Class A common stock (net of costs) (in shares) | 15,800,000 | 64,000,000 |  |  |  |  | 64,000,000 | 0 |
Common stock, shares authorized (in shares) |  | 300,000,000 |  |  |  | 300,000,000 | 300,000,000 | 150,000,000 |
Class B Common Stock | BGC Parnters |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |  |  |
Class B Common Stock | BGC Group |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |  |  |
Futures Exchange Group |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  | $ 4,900,000 |  |  |  |  |

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