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v3.23.1

Organization and Basis of Presentation (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended | 36 Months Ended | 55 Months Ended |  |  |  |  |  |  |
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Jul. 02, 2021 USD ($) shares | Jun. 28, 2021 USD ($) $ / shares shares | Jun. 25, 2021 shares | 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 ($) | Dec. 31, 2020 shares | Mar. 31, 2022 USD ($) shares | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) shares | Jul. 31, 2021 $ / shares | Jun. 30, 2021 USD ($) | Nov. 30, 2019 USD ($) | Jun. 18, 2018 USD ($)
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares settled (in shares) | shares | 944,329 |  |  | 741,505 | 898,685 |  |  |  |  |  |  |  |  |  |  |  |
Investment owned shares settled fair value | $ | $ 166,000 |  |  | $ 93,500 | $ 93,500 |  |  |  |  |  |  |  |  |  |  |  |
Shares owned (in shares) | shares | 5,278,011 |  |  | 250,742 | 93,562 |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities | $ |  |  |  |  |  |  |  |  |  |  | $ 441 | $ 788 |  |  |  |  |
2021 Equity Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense | $ |  | $ 428,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset, net of allowance | $ |  | $ 101,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement share price (in usd per share) | $ / shares |  | $ 12.50 |  |  |  |  |  |  |  |  |  |  |  | $ 13.01 |  |  |
2021 Equity Event | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership units conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.9403 |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount recognized in connection with the earn-out including other income (loss) (in shares) | shares |  |  |  |  |  |  |  |  | 992,247 |  |  |  |  |  |  |  |
Common Stock | Nasdaq |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,093,900 |  |
Common Stock | Nasdaq | Nasdaq |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares pledged to be repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 866,791 |  |  |  |
Value of shares pledged to be repurchased | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 182,000 |  |  |  |
Amount received from the value of shares pledged | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,000 |  |  |  |
Common Stock | Nasdaq Earn-Out |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities | $ | $ 166,000 |  |  | $ 121,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares settled (in shares) | shares | 944,329 |  | 6,222,340 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,600 |
Newmark Holdings, L.P. | Employees | Limited Partnership Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed or exchanged (in shares) | shares |  | 8,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newmark Holdings, L.P. | Independent Contractors | Limited Partnership Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed or exchanged (in shares) | shares |  | 23,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Holdings, L.P. | Employees | Limited Partnership Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed or exchanged (in shares) | shares |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Holdings, L.P. | Independent Contractors | Limited Partnership Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed or exchanged (in shares) | shares |  | 17,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nasdaq Omx | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received from transaction (in shares) | shares |  |  |  |  |  | 992,247 |  |  |  |  |  |  |  |  |  |  |
Nasdaq Omx | eSpeed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration paid in cash | $ |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |
Period for expected payment under Common stock transaction |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Amount recognized in connection with the earn-out including other income (loss) (in shares) | shares |  |  |  |  |  |  |  |  |  | 10,200,000 |  |  |  |  |  |  |
Shares sold under common stock transactions (in shares) | shares |  |  |  |  |  |  |  |  |  | 7,600,000 |  |  |  |  |  |  |
Common stock transactions, realized gain and dividend income | $ |  |  |  |  |  |  |  |  |  | $ 1,474,200 |  |  |  |  |  |  |
Nasdaq Omx | eSpeed | Maximum | BGC Partners Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected payment of shares under common stock transaction (in shares) | shares |  |  |  |  |  |  | 14,883,705 |  |  |  |  |  |  |  |  |  |
Nasdaq Omx | eSpeed | Minimum | BGC Partners Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenue on expected payment per year under common stock transaction | $ |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |
RBC | Newmark OpCo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
RBC | eSpeed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares delivered under common stock transactions (in shares) | shares |  |  |  |  |  |  |  |  |  | 2,600,000 |  |  |  |  |  |  |

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