Debt Instrument, Renewal Term

No definition available.

Name:	bgcg_DebtInstrumentRenewalTerm
Namespace Prefix:	bgcg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit, Maturity Date Extension

+ References

No definition available.

+ Details

Name:	bgcg_LineOfCreditMaturityDateExtension
Namespace Prefix:	bgcg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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-Paragraph 3
-Subparagraph (e)
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+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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+ Details

Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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+ Details

Name:	us-gaap_InterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate amount of interest paid or due on all long-term debt.

+ References

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+ Details

Name:	us-gaap_InterestExpenseLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

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Name:	us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

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Notes Payable and Other Borrowings - Additional Information (Detail)												6 Months Ended		12 Months Ended
	Oct. 01, 2024 USD ($)	Aug. 21, 2024 USD ($)	Apr. 01, 2024 USD ($)	Mar. 12, 2024 USD ($)	Mar. 08, 2024 USD ($)	Oct. 06, 2023 USD ($)	May 22, 2023 USD ($)	Jun. 01, 2021 USD ($)	Sep. 27, 2019 USD ($)	Jul. 24, 2018 USD ($)	Aug. 23, 2017 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 06, 2024 USD ($)	Nov. 08, 2024	Jun. 10, 2024 USD ($)	Jun. 07, 2024 USD ($)	Apr. 26, 2024 USD ($)	Oct. 19, 2023	Oct. 07, 2023 USD ($)	May 25, 2023 USD ($)	May 22, 2023 BRL (R$)	Mar. 10, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 BRL (R$)	Aug. 20, 2021 USD ($)	Aug. 20, 2021 BRL (R$)	Jun. 01, 2021 BRL (R$)	Jan. 25, 2021 USD ($)	Jan. 25, 2021 BRL (R$)	Jul. 10, 2020 USD ($)	Feb. 26, 2020	Apr. 19, 2019 USD ($)	Apr. 08, 2019 USD ($)	Nov. 28, 2018 USD ($)	Aug. 06, 2018 USD ($)	Mar. 19, 2018 USD ($)	Aug. 23, 2017 BRL (R$)	Aug. 22, 2017 USD ($)	Aug. 22, 2017 BRL (R$)
Debt Instrument [Line Items]
Stated interest rate						8.00%
Carrying Amount												$ 944,326,000		$ 1,141,709,000	$ 944,326,000
Line of credit, maturity date extension (in years)																																			2 years
Deferred financing costs												6,500,000		12,000,000	6,500,000
Total														257,435,000
Redemption price as percentage of principal amount (as a percent)									101.00%
Repayments of debt														815,000,000	623,251,000	$ 6,391,000
Parent Company
Debt Instrument [Line Items]
Interest expense												17,528,000	$ 30,700,000	81,066,000		53,652,000
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%
Total														$ 1,100,000	0	0
Principal amount of debt component					$ 400,000,000															$ 400,000,000																			$ 400,000,000	$ 250,000,000
Debt instrument, basis point					(0.25%)
Proceeds from borrowings				$ 275,000,000.0
Repayment of outstanding borrowings	$ 150,000,000.0		$ 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%										8.00%
Carrying Amount		$ 500,000										2,748,000		$ 2,257,000	2,748,000
Debt issuance costs																								$ 3,400,000
Total														200,000	10,000,000.0
Principal amount of debt component																								350,000,000
Carrying amount of debt component																								$ 346,600,000
Debt instrument gross amount														$ 2,300,000
Repayments of debt		$ 500,000
BGC Partners 8.000% Senior Notes due May 25, 2028 \| Senior Notes
Debt Instrument [Line Items]
Carrying Amount																							$ 2,800,000
BGC Group 3.750% Senior Notes due October 1, 2024
Debt Instrument [Line Items]
Stated interest rate						3.75%								3.75%
Carrying Amount												254,814,000		$ 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]
Carrying Amount						$ 255,500,000
BGC Partners 3.750% Senior Notes due October 1, 2024
Debt Instrument [Line Items]
Stated interest rate									3.75%					3.75%
Carrying Amount												44,383,000		$ 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 \| Parent Company
Debt Instrument [Line Items]
Stated interest rate									3.75%
Carrying Amount																							44,500,000
BGC Partners 3.750% Senior Notes due October 1, 2024 \| Senior Notes
Debt Instrument [Line Items]
Carrying Amount						$ 255,500,000
BGC Partners 3.750% Senior Notes due October 1, 2024 \| Level 2
Debt Instrument [Line Items]
Stated interest rate														3.75%
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%
Carrying Amount												286,729,000		$ 287,462,000	286,729,000
Total																0
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]
Carrying Amount						$ 288,200,000								$ 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%
Carrying Amount												11,800,000		$ 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
Interest expense														$ 13,300,000	3,300,000
BGC Partners 4.375% Senior Notes due December 15, 2025 \| Senior Notes
Debt Instrument [Line Items]
Carrying Amount																							$ 11,800,000
BGC Partners 4.375% Senior Notes due December 15, 2025 \| Level 2
Debt Instrument [Line Items]
Stated interest rate														4.375%
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%
Carrying Amount												343,852,000		$ 344,620,000	343,852,000
Total														28,500,000	7,100,000
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]
Carrying Amount						$ 347,200,000
BGC Group Notes Exchange Offer
Debt Instrument [Line Items]
Debt issuance costs						$ 900,000
Unsecured Credit Agreement November 28, 2018 \| New Senior Revolving Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, outstanding amount														200,000,000.0
Deferred financing costs												800,000			800,000
Total														0	6,900,000	2,300,000
Unsecured Credit Agreement November 28, 2018 \| Senior Revolving Credit Agreement
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												239,200,000		195,800,000	239,200,000
Deferred financing costs												800,000		$ 4,200,000	$ 800,000
Average interest rate (as a percent)														6.99%	7.07%
Total														$ 12,200,000	$ 4,400,000	0
Repayment of outstanding borrowings				$ 240,000,000
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 5.375% Senior Notes due July 24, 2023 \| Level 2
Debt Instrument [Line Items]
Stated interest rate														5.375%
BGC Group 6.600% Senior Notes due June 10, 2029
Debt Instrument [Line Items]
Stated interest rate														6.60%				6.60%	6.60%			6.60%
Carrying Amount												0		$ 495,546,000	0
Debt issuance costs																			$ 5,000,000.0
Total														18,900,000
Principal amount of debt component																			500,000,000
Carrying amount of debt component																			$ 495,000,000.0
3.77% loan \| Secured Debt
Debt Instrument [Line Items]
Stated interest rate																																					3.77%
Carrying Amount												0		0	0
Interest expense														0	0	100,000
Debt instrument gross amount																																					$ 15,000,000.0
3.89% Loan \| Secured Debt
Debt Instrument [Line Items]
Stated interest rate																																				3.89%
Carrying Amount														0
Interest expense														0	0	100,000
Debt instrument gross amount																																				$ 10,000,000.0
Unsecured Loan Agreement \| Short Term Loans \| Itau Unibanco S.A.
Debt Instrument [Line Items]
Maximum revolving credit																											$ 1,600,000	R$ 10,000,000														$ 4,000,000.0	R$ 20,000,000.0
Line of credit facility, outstanding amount												0		0	0
Total														$ 0	200,000	300,000
Debt instrument, basis point														3.20%
Unsecured Loan Agreement \| Short Term Loans \| Banco Daycoval S.A.
Debt Instrument [Line Items]
Maximum revolving credit								$ 4,000,000				0		$ 0	0																R$ 20,000,000	$ 2,000,000	R$ 10,000,000
Total																200,000
Debt instrument, basis point								3.66%
Unsecured Credit Agreement \| Intra-Day Overdraft Credit Line
Debt Instrument [Line Items]
Maximum revolving credit											$ 8,100,000														R$ 70,000,000					R$ 60,000,000											R$ 50,000,000.0
Line of credit facility, outstanding amount												$ 0		0	0
Debt instrument, renewal term							90 days
Line of credit facility, fee percentage											1.32%
Line of credit facility, fee														$ 200,000	$ 200,000	$ 200,000
Unsecured Credit Agreement \| Intra-Day Overdraft Credit Line \| Itau Unibanco S.A.
Debt Instrument [Line Items]
Maximum revolving credit							$ 11,300,000																						$ 9,700,000