Related Party Transactions - Cantor Right to Purchase Cantor Units from BGC Holdings (Details)							12 Months Ended
	Oct. 25, 2022 USD ($) shares	May 17, 2022 USD ($) shares	Oct. 28, 2021 USD ($) shares	Mar. 31, 2021 USD ($) shares	Nov. 23, 2018 shares	Jun. 05, 2015 shares	Dec. 31, 2022 shares
Related Party Transaction [Line Items]
Limited Partnership Units Exchange Ratio							1
Cantor Rights to Purchase Exchangeable Units
Related Party Transaction [Line Items]
Exchange class A to class B common stock (in shares)					10,300,000
Cantor Rights to Purchase Exchangeable Units | BGC Holdings LPUs
Related Party Transaction [Line Items]
Limited Partnership Units Exchange Ratio	1
Aggregate Cantor Units as result of redemption (in shares)	275,833	427,494	460,929	1,149,684
Aggregate consideration of Cantor Units as result of redemption | $	$ 397,196	$ 841,010	$ 715,605	$ 2,104,433
Number of Founding Partner Interests as result of redemption (in shares)	275,833	427,494	460,929	1,149,684
Aggregate Cantor Units	77,507	52,681	1,179,942	1,618,376
Aggregate consideration of Cantor Units | $	$ 142,613	$ 105,867	$ 2,033,838	$ 3,040,411
Number of founding partner interests exchanged (in shares)	77,507	52,681	1,179,942	1,618,376
Right to purchase founding partner unit outstanding							300,000
Maximum | Cantor Rights to Purchase Exchangeable Units
Related Party Transaction [Line Items]
Exchange class A to class B common stock (in shares)						34,600,000
Maximum | Cantor Rights to Purchase Exchangeable Units | Class B Common Stock
Related Party Transaction [Line Items]
Exchange class A to class B common stock (in shares)							23,600,000