Debt Instrument, Extended Term

No definition available.

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

- Definition

Debt Instrument, Non-extension Notice Term

+ References

No definition available.

+ Details

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

- 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

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

+ References

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-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ 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

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)(a)(1))
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+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph a
-Publisher SEC

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-Name Regulation S-K (SK)
-Number 229
-Section 1402
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-Subparagraph (1)
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-Topic 942
-SubTopic 220
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(8))
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-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

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

- Definition

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

+ References

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-Topic 946
-SubTopic 830
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-Topic 942
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-Topic 220
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+ Details

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

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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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+ Details

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
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-Subparagraph (b)
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+ Details

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

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
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-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
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-Section S50
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-Subparagraph (b)
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-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

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

- Details

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Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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- Details

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Namespace Prefix:
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Related Party Transactions - BGC Credit Agreement (Details) - USD ($)														12 Months Ended
	Nov. 12, 2025	Jun. 30, 2025	Jun. 05, 2025	Apr. 14, 2025	Apr. 04, 2025	Oct. 01, 2024	Sep. 25, 2024	Jul. 31, 2024	Jun. 10, 2024	Jun. 07, 2024	Apr. 01, 2024	Mar. 12, 2024	Mar. 08, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Aug. 06, 2018	Mar. 19, 2018
Related Party Transaction [Line Items]
Interest expense														$ 365,754,000
Related Party
Related Party Transaction [Line Items]
Interest income														16,100,000	$ 13,800,000	$ 15,100,000
Revolving Credit Facility \| BGC Credit Agreement \| Related Party
Related Party Transaction [Line Items]
Principal amount of debt component										$ 400,000,000.0			$ 400,000,000.0				$ 400,000,000.0	$ 250,000,000.0
Basis points (less than)													0.25%
Average interest rate (as a percent)	5.45%											6.92%	1.00%
Debt instrument, extended term (in years)													1 year
Debt instrument, non-extension notice term													6 months
Maturity term maximum										35 days
Interest expense														200,000	1,100,000	0
Proceeds from borrowings	$ 20,000,000.0											$ 275,000,000.0
Repayment of outstanding borrowings						$ 150,000,000.0					$ 275,000,000.0
Line of credit facility, outstanding amount															$ 0
Interest income														$ 3,800,000
Revolving Credit Facility \| BGC Credit Agreement \| Related Party \| Cantor
Related Party Transaction [Line Items]
Average interest rate (as a percent)														6.17%	7.13%
Proceeds from borrowings					$ 120,000,000.0				$ 180,000,000.0
Repayment of outstanding borrowings		$ 77,000,000.0	$ 28,000,000.0	$ 15,000,000.0			$ 12,000,000.0	$ 18,000,000.0
Line of credit facility, outstanding amount														$ 0	$ 0
Interest income														$ 1,500,000
Senior Revolving Credit Agreement \| Unsecured Credit Agreement November 28, 2018
Related Party Transaction [Line Items]
Average interest rate (as a percent)														6.09%	6.99%
Interest expense														$ 10,200,000	$ 12,200,000	$ 4,400,000
Repayment of outstanding borrowings												$ 240,000,000.0
Line of credit facility, outstanding amount														$ 237,600,000