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Related Party Transactions - Transactions with Executive Officers and Directors (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
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Jun. 02, 2023 | May 18, 2023 | Aug. 11, 2022 | Apr. 01, 2021 | Jun. 30, 2023 | May 31, 2023 | Apr. 30, 2023 | Jun. 30, 2022 | Apr. 30, 2022 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 08, 2023 | Mar. 14, 2022
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  | 3,428,000 | 3,300,000 | 3,086,000 | 7,595,000 | 0 | 9,814,000 | 846,000 | 8,745,000 | 0 | 10,660,000 | 8,745,000 |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  |  | 9,813,827 |  | 8,745,310 |  | 10,659,717 | 8,745,310 |  |
Stock repurchased, weighted average price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 4.44 |  | $ 3.36 |  | $ 4.48 | $ 3.36 |  |
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) | $ 4.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld for tax withholding obligation, price per share (in dollars per share) |  | $ 4.61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld for tax withholding obligation, price per share (in dollars per share) |  | $ 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Exchange share price (in dollars per share) |  |  | $ 4.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  | 135,514 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares redeemed (in shares) |  |  | 27,826 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares redeemed, value |  |  | $ 134,678 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Class A Common Stock | Mr. Merkel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Non-exchangeable Limited Partnership Interests | Reporting Person |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  | 128,279 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,279 |
Shares repurchased (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.79 |

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