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Related Party Transactions - Other Agreements with Cantor (Details) |  |  |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2024 USD ($) | Mar. 11, 2024 | Jul. 01, 2023 shares | Aug. 06, 2018 USD ($) | Jun. 05, 2015 shares | Mar. 31, 2024 USD ($) shares | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Mar. 19, 2018 USD ($) | Aug. 31, 2013 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Reverse repurchase agreements |  |  |  |  |  | $ 0 |  | $ 0 |  |
Commissions |  |  |  |  |  | 415,172,000 | $ 377,288,000 |  |  |
Limited partnership interest, conversion ratio |  |  |  |  | 1 |  |  |  |  |
Conversion of stock, shares converted (in shares) | shares |  |  | 64,000,000 |  |  |  |  |  |  |
Minimum number of shares required to be issued (in shares) | shares |  |  | 75,000,000 |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | $ 20,136,000 | 15,742,000 |  |  |
New Senior Revolving Credit Agreement | Unsecured Credit Agreement |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  |  | 7.19% |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  | $ 0 |  | 239,200,000 |  |
Class B Common Stock | Cantor |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  |  |  |  | 93,300,000 |  |  |  |
Class B Common Stock | CFGM |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  |  |  |  | 3,000,000 |  |  |  |
Class A Common Stock | Cantor |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  |  |  |  | 0 |  |  |  |
Class A Common Stock | CFGM |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  |  |  |  | 0 |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase agreements |  |  |  |  |  | $ 0 |  | 0 |  |
Reverse repurchase agreements |  |  |  |  |  | 0 |  | 0 |  |
Recognition of share of FX gains |  |  |  |  |  | (100,000) | 1,300,000 |  |  |
Commissions |  |  |  |  |  | 100,000 | 100,000 |  |  |
Investment authorization in asset-backed commercial paper program |  |  |  |  |  |  |  |  |  | $ 350,000,000
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares |  |  |  |  | 34,600,000 |  |  |  |  |
Related Party | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 1,100,000 | $ 0 |  |  |
Related Party | Revolving credit facility | BGC Credit Agreement |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  |  |  |  |  | $ 250,000,000 |
Debt instrument, non-extension notice term |  |  |  | 6 months |  |  |  |  |  |
Related Party | Revolving credit facility | Amendment to BGC Credit Agreement |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  | $ 400,000,000 |  |  |  |  | $ 250,000,000 |
Debt instrument, extended term |  |  |  | 1 year |  |  |  |  |  |
Debt instrument, non-extension notice term |  |  |  | 6 months |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  | $ 0 |  |
Proceeds from credit facility | $ 275,000,000 |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount | $ 240,000,000 |  |  |  |  | $ 275,000,000 |  |  |  |
Related Party | Revolving credit facility | Amendment to BGC Credit Agreement | Unsecured Credit Agreement November Twenty Eight Two Thousand Eighteen, Loans Made Under Credit Agreement |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.25% |  |  |  |  |  |  |  |
Interest rate |  | 6.92% |  |  |  | 6.92% |  |  |  |
Related Party | New Senior Revolving Credit Agreement | BGC Credit Agreement | Unsecured Credit Agreement |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  | 7.17% |  |  |  |  |  |  |  |
Related Party | Maximum |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares |  |  |  |  | 34,600,000 |  |  |  |  |

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