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Limited Partnership Interests in BGC Holdings and Newmark Holdings - Narrative (Detail)
6 Months Ended
Jul. 01, 2023
shares
Jun. 30, 2024
installment
partnership
Jun. 05, 2015
Related Party Transaction [Line Items]      
Number of operating partnerships | partnership   2  
Conversion of stock, shares converted (in shares) 64,000,000    
Minimum number of shares required to be issued (in shares) 75,000,000.0    
Limited partnership interest, conversion ratio     1
Number of installments | installment   4  
LPUs      
Related Party Transaction [Line Items]      
Limited partnership interests exchange ratio   0.9248  
Newmark Holdings      
Related Party Transaction [Line Items]      
Calculation of contribution ratio, denominator   2.2  
Limited partnership interest, conversion ratio   1  
Percentage of preferred partnership units awarded   0.6875%  
Percentage of preferred partnership units awarded per calendar year   2.75%  
BGC Holdings      
Related Party Transaction [Line Items]      
Limited partnership interest, conversion ratio   1  
Percentage of preferred partnership units awarded   0.6875%  
Percentage of preferred partnership units awarded per calendar year   2.75%