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Organization and Basis of Presentation (Details) |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2021 USD ($) shares | Jun. 28, 2021 USD ($) shares | Jun. 25, 2021 USD ($) shares | Nov. 30, 2020 USD ($) shares | Dec. 02, 2019 USD ($) shares | Sep. 26, 2018 USD ($) tranche shares | Jun. 28, 2013 USD ($) shares | Jun. 30, 2021 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) | Jul. 01, 2021 $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) | Jun. 18, 2018 USD ($)
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares settled (in shares) | shares |  |  |  | 741,505 | 898,685 |  |  | 944,329 |  |  |  |  |  |
Investment owned shares settled fair value |  |  |  | $ 93,500,000 | $ 93,500,000 |  |  | $ 166,000,000.0 |  |  |  |  |  |
Shares owned (in shares) | shares |  |  |  | 250,742 | 93,562 |  |  | 5,278,011 |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  | $ 1,093,887,000 |  |  | $ 33,283,000 |  |  |
Assets |  |  |  |  |  |  |  | 4,634,095,000 |  |  | 3,982,450,000 |  |  |
Total liabilities |  |  |  |  |  |  |  | 3,042,468,000 |  |  | 3,041,258,000 |  |  |
Retained earnings |  |  |  |  |  |  |  | $ 805,720,000 |  |  | 342,764,000 |  |  |
2021 Equity Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  | $ 428,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset, net of allowance |  | 101,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Settlement share price (usd per share) | $ / shares |  |  |  |  |  |  |  | $ 12.50 |  |  |  |  |  |
Common Class A | 2021 Equity Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership units conversion ratio |  | $ 0.9403 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 2021 Equity Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement share price (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 13.01 |  |  |  |
Common Stock | Nasdaq |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of equity security |  |  | $ 1,093,900,000 |  |  |  |  | $ 1,093,900,000 |  |  | $ 33,300,000 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  | $ (8,000,000.0) |  |
Total liabilities |  |  |  |  |  |  |  |  |  |  |  | 17,900,000 |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | $ (25,900,000) |  |
Nasdaq Earn-Out | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares settled (in shares) | shares |  |  | 6,222,340 |  |  |  |  |  |  |  |  |  |  |
Fair value of equity security |  |  |  | $ 121,900,000 |  |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,600,000 |
Nasdaq Earn-Out | Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares settled (in shares) | shares | 944,329 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of equity security | $ 166,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Nasdaq Omx |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration paid in cash |  |  |  |  |  |  | $ 750,000,000.0 |  |  |  |  |  |  |
Period for expected payment under Common stock transaction (years) |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |
Nasdaq Omx | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received from transaction (in shares) | shares |  |  |  |  |  | 992,247 |  |  |  |  |  |  |  |
BGC Partners Inc | Nasdaq Omx | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected payment of shares under common stock transaction (in shares) | shares |  |  |  |  |  |  | 14,883,705 |  |  |  |  |  |  |
BGC Partners Inc | Nasdaq Omx | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenue on expected payment per year under common stock transaction |  |  |  |  |  |  | $ 25,000,000.0 |  |  |  |  |  |  |
Newmark OpCo | RBC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchangeable preferred limited partnership units issued (in shares) |  |  |  |  |  | $ 150,000,000.0 |  |  |  |  |  |  |  | $ 175,000,000.0
Proceeds from issuance of EPUs |  |  |  |  |  |  |  |  | $ 266,100,000 |  |  |  |  |
Exchangeable preferred limited partnership units, number of tranches | tranche |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Newmark Holdings, L.P. | Limited Partnership Units | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed or exchanged (shares) | shares |  | 8,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Newmark Holdings, L.P. | Limited Partnership Units | Independent Contractors |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed or exchanged (shares) | shares |  | 23,200,000 |  |  |  |  |  |  |  |  |  |  |  |
BGC Holdings, L.P. | Limited Partnership Units | Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed or exchanged (shares) | shares |  | 8,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
BGC Holdings, L.P. | Limited Partnership Units | Independent Contractors |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed or exchanged (shares) | shares |  | 17,400,000 |  |  |  |  |  |  |  |  |  |  |  |

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