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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity      
BCG's purchase of exchange limited partnership units in Newmark Holding (in shares)     16,606,726
Newmark Holdings      
Increase (Decrease) in Stockholders' Equity      
Share converted (in shares)     14,831,234
Newmark OpCo      
Increase (Decrease) in Stockholders' Equity      
Share converted (in shares)     6,903,876
Common Stock      
Increase (Decrease) in Stockholders' Equity      
Dividends declared per share of common stock (dollars per share) $ 0.13 $ 0.40 $ 0.36
Dividends declared and paid per share of common stock (dollars per share) $ 0.13 $ 0.39 $ 0.27
Common Class A      
Increase (Decrease) in Stockholders' Equity      
Treasury stock repurchases (in shares) 930,226 4,518,002 50,000
Common Class A | Common Stock      
Increase (Decrease) in Stockholders' Equity      
Share converted (in shares)     16,292,623
Grant of exchangeability, redemption and issuance of limited partnership interests and issuance of common stock (in shares) 5,840,659 3,867,127 2,052,183
Treasury stock repurchases (in shares) 930,226 4,518,002 50,000
Common Class B | Common Stock      
Increase (Decrease) in Stockholders' Equity      
Share converted (in shares)     5,445,488