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Marketable Securities (Details) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 25, 2021 | Nov. 30, 2020 | Dec. 02, 2019 | Jun. 28, 2013 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Marketable Securities |  |  |  |  |  |  |  |  |  |
Shares settled (in 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) |  | 250,742 | 93,562 |  | 5,278,011 |  | 5,278,011 |  |  |
Gross proceeds from sale of marketable securities |  |  |  |  |  |  | $ 35,412,000 | $ 34,591,000 |  |
Gain (loss) on marketable securities |  |  |  |  |  |  | 4,643,000 | (2,204,000) |  |
Unrealized (gains) loss on marketable securities |  |  |  |  |  |  | $ (16,640,000) | $ 0 |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |
Amount recognized in connection with the earn-out including other income (loss) (in shares) |  |  |  |  |  |  |  |  | 992,247 | 992,247
Number of shares sold in transaction (in shares) |  |  |  |  |  | 0 |  |  |  |
Common Stock | Nasdaq |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |
Number of shares sold in transaction (in shares) |  |  |  |  | 27,134 |  | 250,742 | 343,562 |  |
Gross proceeds from sale of marketable securities |  |  |  |  | $ 3,800,000 |  | $ 35,400,000 | $ 34,600,000 |  |
Gain (loss) on marketable securities |  |  |  |  | 700,000 |  | 4,600,000 | (2,200,000) |  |
Unrealized (gains) loss on marketable securities |  |  |  |  | (14,800,000) | $ 0 | (16,600,000) | $ 0 |  |
Marketable securities | $ 1,093,900,000 |  |  |  | $ 1,093,900,000 |  | $ 1,093,900,000 |  | $ 33,300,000 |
Common Stock | Nasdaq Earn-Out |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |
Shares settled (in shares) | 6,222,340 |  |  |  |  |  |  |  |  |
Marketable securities |  | $ 121,900,000 |  |  |  |  |  |  |  |
Maximum | Common Stock |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |
Remaining earn-out receivable under common stock transaction (in shares) |  |  |  | 6,945,729 |  |  |  |  |  |
Minimum | Common Stock |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |
Gross revenue on earn-out receivable per year under common stock transaction |  |  |  | $ 25,000,000.0 |  |  |  |  |  |
BGC Partners Inc | Common Stock |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |
Period for earn-out receivable under common stock transaction (years) |  |  |  | 7 years |  |  |  |  |  |
BGC Partners Inc | Nasdaq Omx |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |
Period for earn-out receivable under common stock transaction (years) |  |  |  | 15 years |  |  |  |  |  |
BGC Partners Inc | Nasdaq Omx | Maximum |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |
Earn-out shares receivable under common stock transaction (in shares) |  |  |  | 14,883,705 |  |  |  |  |  |
BGC Partners Inc | Nasdaq Omx | Minimum |  |  |  |  |  |  |  |  |  |
Marketable Securities |  |  |  |  |  |  |  |  |  |
Gross revenue on earn-out receivable per year under common stock transaction |  |  |  | $ 25,000,000.0 |  |  |  |  |  |

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