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Organization and Basis of Presentation (Details) $ in Thousands |  |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2020 USD ($) shares | Dec. 02, 2019 USD ($) shares | Sep. 26, 2018 USD ($) tranche shares | Jun. 28, 2013 USD ($) shares | Dec. 31, 2018 USD ($) | Mar. 31, 2021 USD ($) | 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 |  |  |  |  |  |  |  |
Investment owned shares settled fair value | $ 93,500 | $ 93,500 |  |  |  |  |  |  |  |
Shares owned (in shares) | shares | 250,742 | 93,562 |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  | $ 4,001 | $ 33,283 |  |  |
Assets |  |  |  |  |  | 4,000,733 | 3,982,450 |  |  |
Total liabilities |  |  |  |  |  | 3,009,869 | 3,041,258 |  |  |
Retained earnings |  |  |  |  |  | 372,387 | 342,764 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |
Fair value of equity security |  |  |  |  |  | $ 4,000 | $ 33,300 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  | $ (8,000) |  |
Total liabilities |  |  |  |  |  |  |  | 17,900 |  |
Retained earnings |  |  |  |  |  |  |  | $ (25,900) |  |
Nasdaq Earn-Out | Common Stock |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |
Fair value of equity security | $ 121,900 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  | $ 98,600 |
Nasdaq Omx |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |
Purchase consideration paid in cash |  |  |  | $ 750,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Newmark OpCo | RBC |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |
Exchangeable preferred limited partnership units issued (in shares) |  |  | $ 150,000 |  |  |  |  |  |  | $ 175,000
Proceeds from issuance of EPUs |  |  |  |  | $ 266,100 |  |  |  |  |
Exchangeable preferred limited partnership units, number of tranches | tranche |  |  | 4 |  |  |  |  |  |  |

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