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Related Party Transactions - Other Related Party Transactions and Cantor Rights to Purchase Cantor Units from Newmark Holdings (Details) |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |
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Jun. 28, 2021 USD ($) shares | Apr. 27, 2021 shares | Mar. 31, 2021 USD ($) shares | Nov. 30, 2018 USD ($) | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) | Apr. 30, 2021 | Dec. 31, 2020 USD ($) | Nov. 30, 2020 shares | May 15, 2020 USD ($) | Dec. 02, 2019 shares | Nov. 06, 2018 | Dec. 13, 2017
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, related parties |  |  |  |  | $ 0 |  | $ 0 |  |  | $ 0 |  |  |  |  |
Payables to related parties |  |  |  |  | $ 548,000 |  | 548,000 |  |  | $ 4,392,000 |  |  |  |  |
Operating lease payments |  |  |  |  |  |  | 33,200,000 | $ 23,900,000 |  |  |  |  |  |  |
Proceeds from sales of partnership interest |  |  |  |  |  |  | $ 4,025,000 | 0 |  |  |  |  |  |  |
Shares owned (in shares) | shares |  |  |  |  | 5,278,011 |  | 5,278,011 |  |  |  | 250,742 |  | 93,562 |  |
Newmark Acquisition Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired (in percent) |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Common Class A | NEWMARK Group Inc Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio (in percentage) |  |  |  |  | 0.9403 |  | 0.9403 |  |  |  |  |  |  |  |
Cantor | Founding partner interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares |  |  | 273,088 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of partnership interest |  |  | $ 1,105,598 |  |  |  |  |  |  |  |  |  |  |  |
Cantor | Founding partner interest | Newmark Holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares owned (in shares) | shares |  |  |  |  | 217,617 |  | 217,617 |  |  |  |  |  |  |  |
Cantor | Limited partner interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares |  |  | 735,625 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of partnership interest |  |  | $ 2,918,919 |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Persons or Entities | BGC Holdings, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, related parties |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |
Lease, term of contract (in years) |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Affiliated Persons or Entities | BGC Holdings, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease payments |  |  |  |  | $ 100,000 | $ 200,000 | $ 400,000 | $ 200,000 |  |  |  |  |  |  |
Howard W. Lutnick | Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio (in percentage) | 0.9403 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares | 263,025 | 5,154 |  |  |  |  |  |  |  |  |  |  |  |  |
Employee of chairman | Knotel, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base salary | $ 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee of chairman | Knotel, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual discretionary bonus rate (percent) |  |  |  |  | 30.00% |  | 30.00% |  |  |  |  |  |  |  |
Cantor Credit Agreement | Cantor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum revolving credit |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percentage) |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |

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