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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
FPU's | Cantor | Affiliated Persons or Entities    
Increase (Decrease) in Stockholders' Equity    
Issuance of Class A common stock for Newmark RSUs (in shares)   1,008,731
Class A Common Stock    
Increase (Decrease) in Stockholders' Equity    
Treasury stock repurchases (in shares) 1,682,871 879,243
Common Stock    
Increase (Decrease) in Stockholders' Equity    
Dividends declared per share of common stock (in dollars per share) $ 0.03 $ 0.01
Dividends declared and paid per share of common stock (in dollars per share) $ 0.01 $ 0.01
Common Stock | Class A Common Stock    
Increase (Decrease) in Stockholders' Equity    
Grant of exchangeability, redemption and issuance of limited partnership interests and issuance of common stock (in shares) 1,967,863 2,817,271
Treasury stock repurchases (in shares) 1,682,871 879,243