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Limited Partnership Interests in Newmark Holdings and BGC Holdings (Details)
3 Months Ended
Mar. 31, 2022
tranche
shares
Dec. 13, 2017
Related Party Transaction    
Payout period for post-termination awards 4 years  
Percentage to preferred units 0.6875%  
Pecentage to preferred units per calendar year 2.75%  
Exchangeable preferred limited partnership units outstanding (in shares) 0  
Non Distribution Earning Units    
Related Party Transaction    
Award vesting period 4 years  
Class A Common Stock    
Related Party Transaction    
Limited partnership units exchange ratio   1
Class B Common Stock | Cantor    
Related Party Transaction    
Share converted (in shares) 1  
NEWMARK Group Inc Parent | Class A Common Stock    
Related Party Transaction    
Limited partnership units exchange ratio 0.9435  
NEWMARK Group Inc Parent | Class B Common Stock    
Related Party Transaction    
Exchangeable preferred limited partnership units (in shares) 24,600,000  
Newmark OpCo | RBC    
Related Party Transaction    
Exchangeable preferred limited partnership units, number of tranches | tranche 4