v3.26.1
Compensation - Schedule of Limited Partnership Units with a Post-Termination Payout (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
BGC Holdings, L.P.    
Share-based Compensation Arrangement by Share-based Payment Award    
Notional Value $ 141,034 $ 153,976
Estimated fair value of the post-termination payout $ 56,871 $ 61,406
Newmark Holdings Units    
Share-based Compensation Arrangement by Share-based Payment Award    
Outstanding limited partnership units (in shares) 13,300,559 15,082,749
Outstanding limited partnership units - unvested (in shares) 3,088,620 3,959,532