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Compensation - Activity Associated with Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2018
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Newmark Holdings, L.P.        
Restricted Stock Units        
Beginning balance (in shares)   10,646,797 4,683,571  
Number of Units, Issued (in shares)   728,254 7,337,460  
Number of Settled units (delivered shares) (in shares)   (1,217,149) (1,151,507)  
Number of Units, Forfeited units (in shares)   (124,966) (222,727)  
Ending balance (in shares)   10,032,936 10,646,797 4,683,571
Weighted- Average Grant Date Fair Value Per Share        
Balance at the beginning of period (in dollars per share)   $ 7.75 $ 7.55  
Granted (in dollars per share)   5.72 7.96  
Settled units (delivered shares) (in dollars per share)   8.04 8.29  
Forfeited units (in dollars per share)   5.27 7.78  
Balance at the end of period (in dollars per share)   $ 7.60 $ 7.75 $ 7.55
Fair Value Amount        
Balance at beginning of period   $ 82,494 $ 35,361  
Granted   4,163 58,415  
Settled units (delivered shares)   (9,785) (9,549)  
Forfeited units   (658) (1,733)  
Balance at end of period   $ 76,214 $ 82,494 $ 35,361
Weighted- Average Remaining Contractual Term (Years)   5 years 8 months 19 days 5 years 8 months 8 days 5 years 8 months 8 days
Newmark Holdings, L.P. | Minimum        
Fair Value Amount        
Award vesting period (in years) 2 years      
Newmark Holdings, L.P. | Maximum        
Fair Value Amount        
Award vesting period (in years) 8 years      
BGC Holdings, L.P.        
Restricted Stock Units        
Beginning balance (in shares)   8,013 46,807  
Number of Units, Issued (in shares)   0 7,912  
Number of Settled units (delivered shares) (in shares)   (2,638) (45,544)  
Number of Units, Forfeited units (in shares)   0 (1,162)  
Ending balance (in shares)   5,375 8,013 46,807
Weighted- Average Grant Date Fair Value Per Share        
Balance at the beginning of period (in dollars per share)   $ 3.80 $ 9.97  
Granted (in dollars per share)   0 3.69  
Settled units (delivered shares) (in dollars per share)   3.69 9.95  
Forfeited units (in dollars per share)   0 10.64  
Balance at the end of period (in dollars per share)   $ 3.85 $ 3.80 $ 9.97
Fair Value Amount        
Balance at beginning of period   $ 31 $ 467  
Granted   0 29  
Settled units (delivered shares)   (10) (453)  
Forfeited units   0 (12)  
Balance at end of period   $ 21 $ 31 $ 467
Weighted- Average Remaining Contractual Term (Years)   1 year 10 months 28 days 2 years 2 months 1 day 3 months
BGC Holdings, L.P. | Minimum        
Fair Value Amount        
Award vesting period (in years)   2 years    
BGC Holdings, L.P. | Maximum        
Fair Value Amount        
Award vesting period (in years)   4 years