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Related Party Transactions - Cantor Rights to Purchase Cantor Units from BGC Holdings (Details) - Related Party
 6 Months Ended
Jun. 30, 2023
USD ($)
shares
Apr. 16, 2023
USD ($)
shares
Oct. 25, 2022
USD ($)
shares
May 17, 2022
USD ($)
shares
Jun. 05, 2015
shares
Jun. 30, 2023
shares
Related Party Transaction [Line Items]            
Right to exchange from Class A to Class B common stock (up to) (in shares)         34,600,000  
Limited partnership units exchange ratio           1
BGC Holdings LPUs            
Related Party Transaction [Line Items]            
Aggregate Cantor units as result of redemption (in shares)       427,494    
Aggregate consideration of Cantor units as result of redemption | $       $ 841,010    
Number of founding partner interests as result of redemption (in shares) 5,425,209 533,757 275,833 427,494    
Aggregate related party units (in shares) 324,223 85,775 77,507 52,681   324,223
Aggregate consideration of Cantor units | $ $ 598,712 $ 173,154 $ 142,613 $ 105,867    
Number of founding partner interests exchanged (in shares) 324,223 85,775 77,507 52,681    
Aggregate related party units as result of redemption (in shares) 5,425,209 533,757 275,833     5,425,209
Aggregate consideration of related party units as result of redemption (in shares) | $ $ 9,715,772 $ 1,051,080 $ 397,196      
Maximum            
Related Party Transaction [Line Items]            
Right to exchange from Class A to Class B common stock (up to) (in shares)         34,600,000 23,600,000