v3.26.1
Compensation - Schedule of Compensation Expense Related to Limited Partnership Units and Restricted Stock Units (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award        
Issuance of common stock and exchangeability expenses $ 50,140,000 $ 36,953,000 $ 108,424,000 $ 89,232,000
Total compensation expense 4,000.0 0 4,000.0 0
Equity-based compensation and allocations of net income to limited partnership units and FPUs     136,512,000 134,486,000
Newmark Holdings Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Total compensation expense 63,561,000 57,752,000 129,076,000 131,918,000
Equity-based compensation and allocations of net income to limited partnership units and FPUs 68,116,000 60,141,000 136,512,000 134,487,000
Newmark Holdings Units | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partnership units amortization 7,742,000 14,017,000 17,296,000 26,365,000
Newmark Holdings Units | Limited Partnership Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Issuance of common stock and exchangeability expenses 50,140,000 36,953,000 108,424,000 89,232,000
Limited partnership units amortization 5,679,000 6,782,000 3,356,000 16,321,000
Allocations of net income to limited partnership units and FPUs $ 4,555,000 $ 2,389,000 $ 7,436,000 $ 2,569,000