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Schedule I - Parent Company Only - Long Term Debt - Additional Information (Detail) - USD ($) |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2024 | Mar. 08, 2024 | Sep. 27, 2019 | Jul. 24, 2018 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 06, 2024 | Jun. 07, 2024 | Apr. 26, 2024 | Oct. 07, 2023 | Oct. 06, 2023 | Mar. 10, 2022 | Jul. 10, 2020 | Nov. 28, 2018 | Aug. 06, 2018 | Mar. 19, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |
Long-term debt |  |  |  |  | $ 1,141,709,000 | $ 944,326,000 |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  | 12,000,000 | 6,500,000 |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  | $ 257,435,000 |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount (as a percent) |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 5.375% Senior Notes due July 24, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.375% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  | $ 5,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  | 14,500,000 | $ 25,500,000 |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  | $ 450,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount (as a percent) |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  | $ 444,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 5.375% Senior Notes due July 24, 2023 | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.375% |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.75% |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 0 | 44,383,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  | $ 1,300,000 | 9,500,000 | 12,100,000 |  |  |  |  |  |  |  |  |  |
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 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  | $ 255,500,000 |  |  |  |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 44,500,000 |  |  |  |  |  |
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 |  |  |  |  | $ 11,824,000 | 11,800,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,200,000 |  |  |
Total |  |  |  |  | 500,000 | 10,500,000 | 13,800,000 |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000.0 |  |  |
Carrying amount of debt component |  |  |  |  | $ 11,800,000 |  |  |  |  |  |  |  |  | $ 296,800,000 |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 11,800,000 |  |  |  |  |  |
BGC Group 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.75% |  |  |  |  |  |  | 3.75% |  |  |  |  |
Long-term debt |  |  |  |  | $ 0 | 254,814,000 |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  | 7,900,000 | 2,600,000 | 0 |  |  |  |  |  |  |  |  |  |
BGC Group 3.750% Senior Notes due October 1, 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  | $ 255,500,000 |  |  |  |  |
New Senior Revolving Credit Agreement | Unsecured Credit Agreement November 28, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  | 200,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  | 0 | 6,900,000 | 2,300,000 |  |  |  |  |  |  |  |  |  |
Senior Revolving Credit Agreement | Unsecured Credit Agreement November 28, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum revolving credit |  |  |  |  |  |  |  | $ 700,000,000 |  | $ 475,000,000 |  |  | $ 375,000,000.0 |  | $ 350,000,000.0 |  |
Line of credit facility, outstanding amount |  |  |  |  | 195,800,000 | 239,200,000 |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  | $ 4,200,000 | $ 800,000 |  |  |  |  |  |  |  |  |  |  |
Average interest rate (as a percent) |  |  |  |  | 6.99% | 7.07% |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  | $ 12,200,000 | $ 4,400,000 | 0 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | BGC Credit Agreement | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Average interest rate (as a percent) | 6.92% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  | $ 1,100,000 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  | $ 400,000,000 |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  | $ 400,000,000 | $ 250,000,000
Proceeds from borrowings | $ 275,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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