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Limited Partnership Interests in BGC Holdings and Newmark Holdings - Additional Information (Detail)
shares in Millions
 3 Months Ended
Nov. 23, 2018
shares
Mar. 31, 2022
installment
partnership
shares
Related Party Transaction [Line Items]    
Number of operating partnerships | partnership   2
Number Of Installments | installment   4
LPUs    
Related Party Transaction [Line Items]    
Limited partnership interests exchange ratio   0.9435
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%
Cantor Rights to Purchase Exchangeable Units    
Related Party Transaction [Line Items]    
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares 10.3 23.6