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Limited Partnership Interests in Newmark Holdings and BGC Holdings (Details)
shares in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
tranche
shares
Dec. 31, 2023
tranche
shares
Dec. 31, 2022
tranche
Dec. 13, 2017
Related Party Transaction        
Limited partnership units exchange ratio 0.4545 0.4545    
Payout period for post-termination awards   4 years    
Percentage to preferred units 0.6875% 2.75%    
Pecentage to preferred units per calendar year   2.75%    
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
NEWMARK Group Inc Parent | Class A Common Stock        
Related Party Transaction        
Limited partnership units exchange ratio 0.9231 0.9231    
NEWMARK Group Inc Parent | Class B Common Stock        
Related Party Transaction        
Exchangeable preferred limited partnership units (in shares) | shares 24.9 24.9    
Newmark OpCo | RBC        
Related Party Transaction        
Exchangeable preferred limited partnership units, number of tranches | tranche 4 4 4