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Commitments, Contingencies and Guarantees - Summary of Contractual Obligations (Detail) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 06, 2023 | May 25, 2023 | Jul. 10, 2020 | Sep. 27, 2019
Long-Term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
Total | $ 1,190,000,000 |  |  |  |  |  |
Less Than 1 Year | 540,000,000 |  |  |  |  |  |
1-3 Years | 300,000,000 |  |  |  |  |  |
3-5 Years | 350,000,000 |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |  |  |  |  |
Total | 189,186,000 |  |  |  |  |  |
Less Than 1 Year | 31,594,000 |  |  |  |  |  |
1-3 Years | 48,028,000 |  |  |  |  |  |
3-5 Years | 32,624,000 |  |  |  |  |  |
2029 and thereafter | 76,940,000 |  |  |  |  |  |
Finance Lease, Liability, to be Paid [Abstract] |  |  |  |  |  |  |
Total | 5,077,000 |  |  |  |  |  |
Less Than 1 Year | 1,712,000 |  |  |  |  |  |
1-3 Years | 2,738,000 |  |  |  |  |  |
3-5 Years | 627,000 |  |  |  |  |  |
2029 and thereafter | 0 |  |  |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
Total | 12,744,000 |  |  |  |  |  |
Less Than 1 Year | 12,744,000 |  |  |  |  |  |
1-3 Years | 0 |  |  |  |  |  |
3-5 Years | 0 |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |
Contractual Obligation, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
Total | 1,573,469,000 |  |  |  |  |  |
Less Than 1 Year | 644,630,000 |  |  |  |  |  |
1-3 Years | 429,370,000 |  |  |  |  |  |
3-5 Years | 422,529,000 |  |  |  |  |  |
More Than 5 Years | 76,940,000 |  |  |  |  |  |
Interest on Long-term Dent and Collateralized Borrowings Maturity [Abstract] |  |  |  |  |  |  |
Total | 157,560,000 |  |  |  |  |  |
Less Than 1 Year | 49,815,000 |  |  |  |  |  |
1-3 Years | 68,467,000 |  |  |  |  |  |
3-5 Years | 39,278,000 |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |
Interest on Short-term Borrowings [Abstract] |  |  |  |  |  |  |
Total | 71,000 |  |  |  |  |  |
Less Than 1 Year | 71,000 |  |  |  |  |  |
1-3 Years | 0 |  |  |  |  |  |
3-5 Years | 0 |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Total | 18,831,000 |  |  |  |  |  |
Less Than 1 Year | 8,694,000 |  |  |  |  |  |
1-3 Years | 10,137,000 |  |  |  |  |  |
3-5 Years | 0 |  |  |  |  |  |
More Than 5 Years | $ 0 |  |  |  |  |  |
Transition tax on deemed repatriation of foreign subsidiaries earnings payment period | 8 years |  |  |  |  |  |
Contractual obligation, charitable contribution | $ 12,700,000 |  |  |  |  |  |
Total | 944,326,000 | $ 1,045,966,000 |  |  |  |  |
Unsecured senior revolving credit agreement | Unsecured Credit Agreement February 26, 2021 |  |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Carrying amount of long-term debt | 135,000,000 |  |  |  |  |  |
BGC Group 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |
Interest on Long-term Dent and Collateralized Borrowings Maturity [Abstract] |  |  |  |  |  |  |
Total | $ 2,600,000 | 0 | $ 0 |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 3.75% |  |  | 3.75% |  |  |
Total | $ 254,814,000 | 0 |  |  |  |  |
BGC Group 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |
Interest on Long-term Dent and Collateralized Borrowings Maturity [Abstract] |  |  |  |  |  |  |
Total | $ 3,300,000 | 0 | 0 |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 4.375% |  |  | 4.375% |  |  |
Total | $ 286,729,000 | 0 |  |  |  |  |
BGC Group 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |
Interest on Long-term Dent and Collateralized Borrowings Maturity [Abstract] |  |  |  |  |  |  |
Total | 7,100,000 |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 8.00% |  |  |
Total | 343,852,000 | 0 |  |  |  |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |
Interest on Long-term Dent and Collateralized Borrowings Maturity [Abstract] |  |  |  |  |  |  |
Total | $ 9,500,000 | 12,100,000 | $ 12,100,000 |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 3.75% |  |  |  |  |  | 3.75%
Total | $ 44,383,000 | 298,558,000 |  |  |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |
Interest on Long-term Dent and Collateralized Borrowings Maturity [Abstract] |  |  |  |  |  |  |
Total | $ 10,500,000 |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 4.375% |  |  |  |  | 4.375% | 4.375%
Principal amount of notes |  |  |  |  |  | $ 300,000,000 |
Total | $ 11,800,000 | 298,165,000 |  |  |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 | Unsecured senior revolving credit agreement |  |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Debt instrument gross amount | 11,800,000 |  |  |  |  |  |
BGC Partners 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |
Interest on Long-term Dent and Collateralized Borrowings Maturity [Abstract] |  |  |  |  |  |  |
Total | $ 10,000,000 |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 8.00% |  |  |  | 8.00% |  |
Principal amount of notes |  |  |  |  | $ 350,000,000 |  |
Total | $ 2,748,000 | $ 0 |  |  |  |  |
Debt and Collateralized Borrowings | BGC Group 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 3.75% |  |  |  |  |  |
Debt instrument gross amount | $ 254,800,000 |  |  |  |  |  |
Principal amount of notes | 255,500,000 |  |  |  |  |  |
Total | 255,500,000 |  |  |  |  |  |
Interest expense | $ 7,100,000 |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Group 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 4.375% |  |  |  |  |  |
Debt instrument gross amount | $ 286,700,000 |  |  |  |  |  |
Principal amount of notes | 288,200,000 |  |  |  |  |  |
Total | 288,200,000 |  |  |  |  |  |
Interest expense | $ 24,500,000 |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Group 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 8.00% |  |  |  |  |  |
Debt instrument gross amount | $ 343,900,000 |  |  |  |  |  |
Principal amount of notes | 347,200,000 |  |  |  |  |  |
Total | 347,200,000 |  |  |  |  |  |
Interest expense | $ 122,300,000 |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Partners 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 3.75% |  |  |  |  |  |
Debt instrument gross amount | $ 44,400,000 |  |  |  |  |  |
Principal amount of notes | 44,500,000 |  |  |  |  |  |
Total | 44,500,000 |  |  |  |  |  |
Interest expense | $ 1,200,000 |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 4.375% |  |  |  |  |  |
Principal amount of notes | $ 11,800,000 |  |  |  |  |  |
Total | 11,800,000 |  |  |  |  |  |
Interest expense | $ 1,000,000 |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Partners 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Stated interest rate | 8.00% |  |  |  |  |  |
Debt instrument gross amount | $ 2,700,000 |  |  |  |  |  |
Principal amount of notes | 2,800,000 |  |  |  |  |  |
Total | 2,800,000 |  |  |  |  |  |
Interest expense | 1,000,000 |  |  |  |  |  |
One-time Transition Tax |  |  |  |  |  |  |
One-time Transition Tax [Abstract] |  |  |  |  |  |  |
Transition tax on deemed repatriation of foreign subsidiaries earnings net cumulative tax expense net of foreign tax credits | $ 28,600,000 |  |  |  |  |  |
Percentage of transition tax to be paid in equal installments over first five years | 40.00% |  |  |  |  |  |
Percentage of remaining transition tax to be paid in installments in years six to eight | 60.00% |  |  |  |  |  |
Percentage of remaining transition tax to be paid in installments in year six | 15.00% |  |  |  |  |  |
Percentage of remaining transition tax to be paid in installments in year seven | 20.00% |  |  |  |  |  |
Percentage of remaining transition tax to be paid in installments in year eight | 25.00% |  |  |  |  |  |
Transition tax on deemed repatriation of foreign subsidiaries earnings net cumulative remaining balance | $ 18,800,000 |  |  |  |  |  |

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