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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