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Related Party Transactions - Transactions with Executive Officers and Directors (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Aug. 08, 2024 $ / shares shares | Jan. 02, 2024 $ / shares shares | Sep. 21, 2023 $ / shares shares | Jul. 12, 2023 USD ($) | Jul. 12, 2023 GBP (£) | Jul. 11, 2023 GBP (£) | Jul. 10, 2023 USD ($) $ / shares shares | Jul. 01, 2023 USD ($) shares | Jun. 30, 2023 USD ($) shares | Jun. 08, 2023 $ / shares shares | Jun. 02, 2023 $ / shares shares | May 18, 2023 USD ($) $ / shares shares | Apr. 18, 2023 $ / shares shares | Apr. 01, 2021 shares | Sep. 30, 2024 shares | Aug. 31, 2024 shares | Jul. 31, 2024 shares | Sep. 30, 2023 shares | Aug. 31, 2023 shares | Jul. 31, 2023 shares | Apr. 30, 2023 shares | Sep. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2024 shares | Mar. 31, 2024 shares | Sep. 30, 2023 $ / shares shares | Jun. 30, 2023 shares | Mar. 31, 2023 shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 $ / shares shares
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,046,000 | 4,807,000 | 2,040,000 | 3,474,000 | 1,612,000 | 3,000,000 |  | 7,893,000 | 10,688,000 | 11,250,000 | 8,087,000 | 9,814,000 | 846,000 | 29,831,000 | 18,747,000
Deed of amendment, notice period |  |  |  | 24 months | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,013,116 |  |  | 8,086,750 |  |  | 26,264,523 | 18,746,467
Stock repurchased, weighted average price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.05 |  |  | $ 4.99 |  |  | $ 8.06 | $ 4.70
Shares granted in period (in shares) |  |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 4.45 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,700,000 |  |  |  |  |  | $ 24,900,000 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  | 25,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation | $ |  |  |  |  |  |  |  | $ 74,000,000 | $ 49,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate estimated grant date fair value | $ |  |  |  | $ 3,986,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,413,000 |
Restricted Stock Units (RSUs) | Mr. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested in period (in shares) |  |  |  |  |  |  | 720,509 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation | $ |  |  |  |  |  |  | $ 780,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Reporting Person |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) | 13,063 | 136,891 | 474,808 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) | $ / shares | $ 9.11 | $ 6.98 | $ 5.29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 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 | Exchangeable Limited Partnership Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Exchangeable Limited Partnership Units | Reporting Person |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  |  | 128,279 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 4.79 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,279 |  |  |  |  |  |  |  |
Related Party | Non-exchangeable LPUs | Reporting Person |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,279 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 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 | Non-exchangeable PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 11,332,727 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 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 | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period | $ |  |  |  |  |  |  |  |  |  |  |  | $ 6,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Incrementally Monetized Non-exchangeable PSUs & PPSUs | On 5/18/2023 | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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 | Newmark |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period | $ |  |  |  |  |  |  |  |  |  |  |  | $ 9,148,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Non-exchangeable HDU | Mr. Lutnick | BGC Partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period | $ |  |  |  |  |  |  |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  | 16,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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