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Notes Payable and Other Borrowings - Narrative (Detail) R$ in Millions |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 02, 2025 USD ($) | Jun. 10, 2024 USD ($) | Apr. 01, 2024 USD ($) | Mar. 12, 2024 USD ($) | Mar. 08, 2024 USD ($) | Oct. 06, 2023 USD ($) | May 22, 2023 USD ($) | Sep. 27, 2019 USD ($) | Aug. 23, 2017 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 06, 2024 USD ($) | Aug. 21, 2024 USD ($) | Jun. 07, 2024 USD ($) | Apr. 26, 2024 USD ($) | Oct. 19, 2023 | Oct. 07, 2023 USD ($) | May 25, 2023 USD ($) | May 22, 2023 BRL (R$) | Mar. 10, 2022 USD ($) | Aug. 20, 2021 USD ($) | Aug. 20, 2021 BRL (R$) | Jul. 10, 2020 USD ($) | Feb. 26, 2020 | Nov. 28, 2018 USD ($) | Aug. 06, 2018 USD ($) | Mar. 19, 2018 USD ($) | Aug. 23, 2017 BRL (R$)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 1,836,090,000 |  | $ 1,836,090,000 |  | $ 1,141,709,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, maturity date extension (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Deferred financing cost |  |  |  |  |  |  |  |  |  | 16,700,000 |  | 16,700,000 |  | 12,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  |  |  |  |  |  |  | 1,917,835,000 |  | 1,917,835,000 |  | 1,337,540,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount (as a percent) |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | BGC Credit Agreement | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate (as a percent) |  |  |  | 6.92% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  | 0 | $ 0 | 0 | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 | $ 250,000,000.0 |
Proceeds from borrowings |  |  |  | $ 275,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding borrowings |  |  | $ 275,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 2,260,000 |  | $ 2,260,000 |  | 2,257,000 |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,400,000 |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 346,600,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 8.000% Senior Notes due May 25, 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |
BGC Group 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 3.75% |  |  |  | 3.75% |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  |  | 2,600,000 |  | 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Group 3.750% Senior Notes due October 1, 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 255,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 3.75% |  | 3.75% |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  |  | 400,000 |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  |  |  |  | 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  |  |  |  |  | $ 296,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,500,000 |  |  |  |  |  |  |  |  |  |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 255,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Group 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.375% |  |  |  | 4.375% |  | 4.375% |  |  |  |  |  |  | 4.375% |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 287,829,000 |  | $ 287,829,000 |  | 287,462,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  | 3,300,000 | 3,300,000 | 6,700,000 | 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount (as a percent) |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Group 4.375% Senior Notes due December 15, 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 288,200,000 |  |  |  | $ 14,500,000 |  | $ 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 4.375% |  | 4.375% |  | 4.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 11,836,000 |  | $ 11,836,000 |  | 11,824,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  | $ 100,000 | 100,000 | $ 300,000 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,800,000 |  |  |  |  |  |  |  |  |  |  |
BGC Group 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 8.00% |  |  |  | 8.00% |  | 8.00% |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 345,003,000 |  | $ 345,003,000 |  | 344,620,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  | 7,100,000 | $ 7,100,000 | 14,300,000 | $ 14,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount (as a percent) |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Group 8.000% Senior Notes due May 25, 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 347,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Group Notes Exchange Offer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Credit Agreement | Senior revolving credit agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum revolving credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000.0 |  |  | $ 475,000,000.0 |  |  |  |  | $ 375,000,000.0 |  |  |  |  | $ 350,000,000.0 |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  |  |  |  |  | 81,700,000 |  | 81,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing cost |  |  |  |  |  |  |  |  |  | $ 3,300,000 |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 6.17% | 7.17% | 6.17% | 7.18% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  | $ 2,300,000 | $ 4,200,000 | $ 6,300,000 | $ 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding borrowings |  |  |  | $ 240,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Credit Agreement | New Senior Revolving Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 195,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing cost |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Group 6.600% Senior Notes due June 10, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.60% |  |  |  |  |  |  |  | 6.60% |  | 6.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 496,046,000 |  | $ 496,046,000 |  | 495,546,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  | $ 8,500,000 | 1,900,000 | $ 17,000,000.0 | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.375% |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,200,000 |  |  |  |  |
Principal amount of debt component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000.0 |  |  |  |  |
Carrying amount of debt component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 296,800,000 |  |  |  |  |
BGC Group 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 8.00% |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  | $ 0 | 100,000 | $ 100,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000.0 |  |  |  |  |  |  |  |  |  |
BGC Group 6.600% Senior Notes due June 10, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 496,000,000.0 |  | 496,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  | 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component |  | $ 495,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Group 6.150% Senior Notes due April 2, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 693,116,000 |  | 693,116,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs | $ 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  |  |  |  |  |  |  | $ 10,900,000 |  | $ 10,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component | $ 692,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount (as a percent) | 101.00% | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Group 6.150% Senior Notes due April 2, 2030 | Related Party | Underwriting fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 6.15% |  | 6.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component | $ 700,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured credit agreement | Intra-day overdraft credit line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, renewal term |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, fee |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 100,000 | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured credit agreement | Intra-day overdraft credit line | Itau Unibanco S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum revolving credit |  |  |  |  |  |  | $ 12,800,000 |  | $ 9,200,000 |  |  |  |  |  |  |  |  |  |  |  |  | R$ 70.0 |  | $ 11,000,000.0 | R$ 60.0 |  |  |  |  |  | R$ 50.0
Line of credit facility, outstanding amount |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, fee percentage (as a percent) |  |  |  |  |  |  |  |  | 1.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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