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Related Party Transactions - Cantor Rights to Purchase Cantor Units from Newmark Holdings (Details)
Nov. 18, 2025
USD ($)
shares
Feb. 18, 2025
shares
Mar. 31, 2026
USD ($)
shares
Dec. 31, 2025
USD ($)
Nov. 06, 2018
Dec. 13, 2017
Related Party Transaction            
Limited partnership units exchange ratio   0.9279 0.4545      
Receivable related to tax receivable agreement | $     $ 19,500,000      
Payable related to tax receivable agreement | $     $ 17,511,000 $ 17,511,000    
Related Party            
Related Party Transaction            
Tax receivable agreement, cash savings, percentage     85.00%      
General partners' capital account, units outstanding (in shares)     114,135      
Founding partner interest | Related Party            
Related Party Transaction            
Issuance of Class A common stock for Newmark RSUs (in shares) 524,108          
Proceeds from the sale of limited partnership interests | $ $ 1,909,908          
Founding partner interest | Related Party | Exchangeable Limited Partnership Interests            
Related Party Transaction            
Unit exercised during period (in shares)   7,782,387        
Unit granted during period (in shares)   7,221,277        
Limited partner interest | Related Party            
Related Party Transaction            
Issuance of Class A common stock for Newmark RSUs (in shares) 71,524          
Proceeds from the sale of limited partnership interests | $ $ 302,750          
Common Stock            
Related Party Transaction            
Limited partnership units exchange ratio         1  
Class A Common Stock            
Related Party Transaction            
Limited partnership units exchange ratio           1
Class A Common Stock | Newmark Holdings Units            
Related Party Transaction            
Limited partnership units exchange ratio     0.9270