Related Party Transactions - Cantor Rights to Purchase Cantor Units from BGC Holdings (Details) - Related Party - USD ($)	Jun. 30, 2023	Apr. 16, 2023	Oct. 25, 2022	May 17, 2022	Jun. 05, 2015
Related Party Transaction [Line Items]
Right to exchange from Class A to Class B common stock (up to) (in shares)					34,600,000
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
Aggregate consideration of Cantor units	$ 598,712	$ 173,154		$ 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
Aggregate consideration of related party units as result of redemption (in shares)	$ 9,715,772	$ 1,051,080	$ 397,196
Aggregate consideration of related party units (in shares)			$ 142,613
Maximum
Related Party Transaction [Line Items]
Right to exchange from Class A to Class B common stock (up to) (in shares)					34,600,000