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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 | Oct. 28, 2021 | Mar. 31, 2021 | Jun. 05, 2015
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Related Party Transaction [Line Items] |  |  |  |  |  |  |
Number of shares, right to exchange from Class A to Class B common stock (in shares) |  |  |  |  |  |  | 34,600,000
BGC Holdings LPUs |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Number of founding partner interests as result of redemption (in shares) | 5,425,209 | 533,757 | 275,833 | 427,494 | 460,929 | 1,149,684 |
Aggregate related party units (in shares) | 324,223 | 85,775 | 77,507 | 52,681 | 1,179,942 | 1,618,376 |
Number of founding partner interests exchanged (in shares) | 324,223 | 85,775 | 77,507 | 52,681 | 1,179,942 | 1,618,376 |
Aggregate related party units as result of redemption (in shares) | 5,425,209 | 533,757 | 275,833 | 427,494 | 460,929 | 1,149,684 |
Aggregate consideration of related party units as result of redemption (in shares) | $ 9,715,772 | $ 1,051,080 | $ 397,196 | $ 841,010 | $ 715,605 | $ 2,104,433 |
Aggregate consideration of Cantor Units | $ 598,712 | $ 173,154 | $ 142,613 | $ 105,867 | $ 2,033,838 | $ 3,040,411 |
Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Number of shares, right to exchange from Class A to Class B common stock (in shares) |  |  |  |  |  |  | 34,600,000

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