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Compensation - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
shares
Dec. 31, 2021
shares
Dec. 31, 2020
shares
Dec. 13, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award        
Shares available for future awards (in shares) 331,600,000      
Number of shares vested and converted (in shares) 2,400,000      
Unrecognized compensation expense related to unvested RSUs | $ $ 87.5      
Executives And Non Executives Employees        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partners capital account units held by BGC (in shares) 68,400,000      
Non Distribution Earning Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting period 4 years      
Unit granted during period (in shares) 900,000      
Newmark Holdings, L.P.        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partnership units exchange ratio 0.4545      
NEWMARK Group Inc Parent        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partners capital account units held by BGC (in shares) 12,627,232 11,691,406    
Limited partnership units outstanding (in shares) 22,218,169 18,419,613 66,626,185  
NEWMARK Group Inc Parent | Limited Partnership Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partnership units outstanding (in shares) 4,000,000 4,200,000    
Exchangeable partnership units (in shares) 1,300,000 1,300,000    
BGC Holdings, L.P.        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partnership units outstanding (in shares) 8,051,053 8,663,930 54,422,002  
BGC Holdings, L.P. | Limited Partnership Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partnership units outstanding (in shares) 6,200,000 6,800,000    
Exchangeable partnership units (in shares) 2,800,000 3,100,000    
Minimum | NEWMARK Group Inc Parent | Limited Partnership Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting period 3 years      
Maximum | NEWMARK Group Inc Parent | Limited Partnership Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting period 7 years      
Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partnership units exchange ratio       1
Class A Common Stock | NEWMARK Group Inc Parent        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partnership units exchange ratio 0.9435      
Newmark Equity Plan | Class A Common Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Shares authorized to be delivered pursuant to awards granted (in shares)       400,000,000
Shares registered to be delivered pursuant to awards granted (in shares)       115,000,000