v3.26.1
Compensation - Activity Associated with Limited Partnership Units Awarded to BGC Employees (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
LPUs | Newmark Holdings        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of units, redeemed (in shares) 43,000 49,000 76,000 148,000