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Related Party Transactions - Transactions with Executive Officers and Directors (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Oct. 08, 2024 | Oct. 07, 2024 | Aug. 08, 2024 | Jan. 02, 2024 | Sep. 21, 2023 | Jul. 01, 2023 | Jun. 30, 2023 | Jun. 08, 2023 | Jun. 02, 2023 | May 18, 2023 | Apr. 18, 2023 | Aug. 11, 2022 | Apr. 01, 2021 | Dec. 31, 2024 | Nov. 30, 2024 | Oct. 31, 2024 | Apr. 30, 2023 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 14, 2022
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 6,369,000 |  | 7,893,000 | 10,688,000 | 11,250,000 | 5,473,000 | 8,087,000 | 9,814,000 | 846,000 | 36,200,000 | 24,220,000 |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.84
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  | 135,514 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange share price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 4.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares redeemed (in shares) |  |  |  |  |  |  |  |  |  |  |  | 27,826 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares redeemed, value |  |  |  |  |  |  |  |  |  |  |  | $ 134,678 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,573,031 | 23,250,551 | 27,086,884 |
Stock repurchased, weighted average price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.30 | $ 4.94 |  |
Shares granted in period (in shares) |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld for tax withholding obligation, price per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 4.61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Exchangeable Limited Partnership Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Class A Common Stock | Share-Based Payment Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Windeatt | Newmark Holdings LPU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) | 31,700 | 327,127 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount | $ 27,130 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Windeatt | Newmark Holdings PLPU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) | 2,953 | 30,285 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount |  | $ 278,258 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period |  | $ 251,128 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  | 27,332 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Windeatt | Class A Common Stock | Newmark Holdings LPU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  | 239,428 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Windeatt | Class A Common Stock | Newmark Holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  | 271,362 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Reporting Person | Exchangeable Limited Partnership Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  | 128,279 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) |  |  |  |  |  |  |  | $ 4.79 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,279 |  |  |  |  |  |  |  |  |  |  |
Related Party | Reporting Person | Non-exchangeable LPUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 128,279 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Reporting Person | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  | $ 9.11 | $ 6.98 | $ 5.29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel | NPU-CV, PSU-CV & PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel | NPSU-CV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 148,146 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel | PSU-CV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 33,585 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel | PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 74,896 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel | NPPSU-CV & PPSU-CV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period |  |  |  |  |  |  |  |  |  | $ 843,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel | NPPSU-CV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 148,146 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount |  |  |  |  |  |  |  |  |  | $ 681,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel | PPSU-CV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 33,585 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount |  |  |  |  |  |  |  |  |  | $ 162,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) |  |  |  |  |  |  |  |  | $ 4.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, net (in shares) |  |  |  |  |  |  |  |  |  | 196,525 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel | Class A Common Stock | Share-Based Payment Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  | 256,627 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount |  |  |  |  |  |  |  |  |  | $ 6,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Non-exchangeable PSUs & PPSUs | Prior To 5/18/2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount |  |  |  |  |  |  |  |  |  | $ 474,195 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Non-exchangeable PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 11,332,727 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Non-exchangeable PSU | Prior To 5/18/2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 7,879,736 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Non-exchangeable PPSU | Prior To 5/18/2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 103,763 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Incrementally Monetized Non-exchangeable PSUs & PPSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period |  |  |  |  |  |  |  |  |  | $ 6,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Incrementally Monetized Non-exchangeable PSUs & PPSUs | On 5/18/2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount |  |  |  |  |  |  |  |  |  | $ 6,175,805 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Incrementally Monetized Non-exchangeable PSU | On 5/18/2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 3,452,991 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Incrementally Monetized Non-exchangeable PPSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 1,451,805 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Incrementally Monetized Non-exchangeable PPSU | On 5/18/2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 1,348,042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Exchangeable PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 520,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Non-exchangeable HDU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Shares redeemed in period (in shares) |  |  |  |  |  |  |  |  |  | 1,474,930 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Non-exchangeable HDU | Newmark |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Shares redeemed in period |  |  |  |  |  |  |  |  |  | $ 9,148,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Non-exchangeable HDU | BGC Parnters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Shares redeemed in period |  |  |  |  |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, net (in shares) |  |  |  |  |  |  |  |  |  | 5,710,534 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Class A Common Stock | Share-Based Payment Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, net (in shares) |  |  |  |  |  |  |  |  |  | 232,610 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Class A Common Stock | Share-Based Payment Arrangement | Non-exchangeable PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  | 11,332,727 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Lutnick | Class A Common Stock | Share-Based Payment Arrangement | Exchangeable PSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  |  |  |  |  | 520,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Ms. Bell | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 21,786 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 4.59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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