v3.26.1
Compensation - Activity Associated with Limited Partnership Units Awarded to BGC Employees (Details) - shares
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
LPUs | Newmark Holdings    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of units, redeemed (in shares) 33,000 99,000