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Related Party Transactions - Transactions with Executive Officers and Directors (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 04, 2025
Oct. 08, 2024
Oct. 07, 2024
Aug. 08, 2024
Jan. 02, 2024
Mar. 31, 2025
Feb. 28, 2025
Jan. 31, 2025
Mar. 31, 2024
Feb. 29, 2024
Jan. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Related Party Transaction [Line Items]                          
Repurchase of class A common stock (in shares)           13,000 0 3,171,000 1,055,000 6,586,000 3,609,000 3,184,000 11,250,000
Class A Common Stock                          
Related Party Transaction [Line Items]                          
Repurchase of class A common stock (in shares)                       2,444,829 9,820,280
Stock repurchased, weighted average price (in dollars per share)                       $ 9.36 $ 7.11
Related Party | Dr. Bell | Class A Common Stock                          
Related Party Transaction [Line Items]                          
Repurchase of class A common stock (in shares) 12,727                        
Stock repurchased, weighted average price (in dollars per share) $ 9.35                        
Related Party | Mr. Windeatt                          
Related Party Transaction [Line Items]                          
Shares redeemed in period   $ 0                      
Related Party | Mr. Windeatt | Newmark Holdings LPU                          
Related Party Transaction [Line Items]                          
Shares redeemed in period (in shares)   31,700 327,127                    
Determination amount   $ 27,130                      
Related Party | Mr. Windeatt | Newmark Holdings PLPU                          
Related Party Transaction [Line Items]                          
Shares redeemed in period (in shares)   2,953 30,285                    
Determination amount     $ 278,258                    
Shares redeemed in period     $ 251,128                    
Shares granted in period (in shares)     27,332                    
Related Party | Mr. Windeatt | Class A Common Stock | Newmark Holdings LPU                          
Related Party Transaction [Line Items]                          
Shares redeemed in period (in shares)     239,428                    
Related Party | Mr. Windeatt | Class A Common Stock | Newmark Holdings LPUs                          
Related Party Transaction [Line Items]                          
Shares redeemed in period (in shares)     271,362                    
Related Party | Reporting Person | Class A Common Stock                          
Related Party Transaction [Line Items]                          
Repurchase of class A common stock (in shares)       13,063 136,891                
Stock repurchased, weighted average price (in dollars per share)       $ 9.11 $ 6.98