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Related Party Transactions - Transactions with Executive Officers and Directors (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Jan. 02, 2024 $ / shares shares | Jul. 12, 2023 USD ($) | Jul. 12, 2023 GBP (£) | Jul. 11, 2023 GBP (£) | Jul. 10, 2023 USD ($) $ / shares | Jul. 02, 2023 shares | Jul. 01, 2023 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 02, 2023 $ / shares shares | May 18, 2023 USD ($) $ / shares shares | Apr. 18, 2023 $ / shares shares | Aug. 11, 2022 USD ($) $ / shares shares | Dec. 21, 2021 shares | Apr. 23, 2021 USD ($) $ / shares shares | Dec. 31, 2023 shares | Nov. 30, 2023 shares | Oct. 31, 2023 USD ($) shares | Sep. 30, 2023 shares | Jun. 30, 2023 shares | Mar. 31, 2023 shares | Dec. 31, 2022 shares | Sep. 30, 2022 shares | Jun. 30, 2022 shares | Mar. 31, 2022 shares | Dec. 31, 2023 shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) shares | Mar. 14, 2022 $ / shares shares | Mar. 02, 2020 $ / shares
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deed of amendment, notice period |  | 24 months | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of Class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,204,000 | 4,269,000 | 8,087,000 | 9,814,000 | 846,000 | 5,945,000 | 12,397,000 | 8,745,000 | 0 |  | 24,220,000 | 27,087,000 |  |  |
Sean A. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-exchangeable LPU-NEWs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135,514 |
Number of non-exchangeable PLPU (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,826 |
Average determination price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.84 |
Exchange share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 4.08 |  | $ 5.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.38
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  | 135,514 |  | 123,713 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares redeemed (in shares) |  |  |  |  |  |  |  |  |  |  |  | 27,826 |  | 28,477 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares redeemed, value | $ |  |  |  |  |  |  |  |  |  |  |  | $ 134,678 |  | $ 178,266 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  | $ 4.45 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of Class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,250,551 | 27,086,884 | 68,253,498 |  |
Issuance of Class A common stock (net of costs) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 518,191 | 500,697 | 417,247 |  |
Stock repurchased, weighted average price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.94 | $ 3.84 |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A common stock (net of costs) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 90,366 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A common stock (net of costs) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 2,011,731 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A common stock (net of costs) (in shares) |  |  |  |  |  | 15,800,000 | 64,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,000,000 | 0 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation | $ |  |  |  |  |  |  | $ 74,000,000 | $ 49,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate estimated grant date fair value | $ |  | $ 3,986,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,494,000 | $ 18,743,000 | $ 12,792,000 |  |
Shares granted in period (in shares) |  |  |  |  |  |  | 25,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Mr. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation | $ |  |  |  |  | $ 780,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A common stock (net of costs) (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Shares withheld for tax withholding obligation, price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 4.61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount | $ |  |  |  |  |  |  |  |  |  | $ 6,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawings, aggregate amount, per year | £ |  |  | £ 700,000 | £ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Class A Common Stock | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of Class A common stock (in shares) |  |  |  |  |  |  |  |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 4.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, net (in shares) |  |  |  |  |  |  |  |  |  | 196,525 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Class A Common Stock | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, net (in shares) |  |  |  |  |  |  |  |  |  | 5,710,534 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Class A Common Stock | Reporting Person | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of Class A common stock (in shares) | 136,891 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) | $ / shares | $ 6.98 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Class A Common Stock | Ms. Bell |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of Class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 21,786 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 4.59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | NPU-CV, PSU-CV & PSU | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period | $ |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | NPSU-CV | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 148,146 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | PSU-CV | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 33,585 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | PSU | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 74,896 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | PSU | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period | $ |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | NPPSU-CV & PPSU-CV | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period | $ |  |  |  |  |  |  |  |  |  | $ 843,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | NPPSU-CV | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 148,146 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount | $ |  |  |  |  |  |  |  |  |  | $ 681,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | PPSU-CV | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 33,585 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount | $ |  |  |  |  |  |  |  |  |  | $ 162,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Share-Based Payment Arrangement | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Related Party | Share-Based Payment Arrangement | Class A Common Stock | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  | 256,627 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Share-Based Payment Arrangement | Class A Common Stock | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, net (in shares) |  |  |  |  |  |  |  |  |  | 232,610 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Share-Based Payment Arrangement | Class A Common Stock | Mr. Lutnick | Exchangeable PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  | 520,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Share-Based Payment Arrangement | Class A Common Stock | Mr. Lutnick | Non-exchangeable PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  | 11,332,727 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Non-exchangeable PSUs & PPSUs | Prior To 5/18/2023 | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount | $ |  |  |  |  |  |  |  |  |  | $ 474,195 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Non-exchangeable PSU | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 11,332,727 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Non-exchangeable PSU | Prior To 5/18/2023 | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 7,879,736 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Non-exchangeable PPSU | Prior To 5/18/2023 | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 103,763 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Incrementally Monetized Non-exchangeable PSUs & PPSUs | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Shares redeemed in period | $ |  |  |  |  |  |  |  |  |  | $ 6,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Incrementally Monetized Non-exchangeable PSUs & PPSUs | On 5/18/2023 | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount | $ |  |  |  |  |  |  |  |  |  | $ 6,175,805 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Incrementally Monetized Non-exchangeable PSU | On 5/18/2023 | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 3,452,991 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Incrementally Monetized Non-exchangeable PPSU | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 1,451,805 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Incrementally Monetized Non-exchangeable PPSU | On 5/18/2023 | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 1,348,042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Exchangeable PSU | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 520,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Non-exchangeable HDU | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 1,474,930 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Non-exchangeable HDU | Mr. Lutnick | BGC Parnters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period | $ |  |  |  |  |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Non-exchangeable HDU | Mr. Lutnick | Newmark |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period | $ |  |  |  |  |  |  |  |  |  | $ 9,148,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,900,000 |  |  |  |  |

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