Debt Instrument, Renewal Term

No definition available.

Name:	bgcp_DebtInstrumentRenewalTerm
Namespace Prefix:	bgcp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed assets pledged for secured loan value.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Line Of Credit, Automatic Renewal Term

+ References

No definition available.

+ Details

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

- Definition

Tendered amount on cash tender offer.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

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- 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.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

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Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

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Period Type:	duration

- Definition

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

+ References

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- 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

No definition available.

+ Details

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- Definition

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

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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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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.

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Balance Type:	debit
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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- Definition

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

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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.

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Period Type:	instant

- Definition

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

+ References

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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.

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- Definition

The effective interest rate at the end of the reporting period.

+ References

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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

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- 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.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Notes Payable, Other and Short-Term Borrowings - Additional Information (Detail)									12 Months Ended
	Nov. 01, 2021 USD ($)	Jun. 01, 2021 USD ($)	May 27, 2021 USD ($)	Jul. 10, 2020 USD ($)	Feb. 26, 2020	Sep. 27, 2019 USD ($)	Aug. 23, 2017 USD ($)	Aug. 22, 2017 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 BRL (R$)	Aug. 20, 2021 USD ($)	Aug. 20, 2021 BRL (R$)	Jun. 01, 2021 BRL (R$)	Jan. 25, 2021 USD ($)	Jan. 25, 2021 BRL (R$)	Dec. 31, 2020 BRL (R$)	Aug. 14, 2020	Aug. 11, 2020 USD ($)	Aug. 05, 2020 USD ($)	Apr. 19, 2019 USD ($)	Apr. 08, 2019 USD ($)	Nov. 28, 2018 USD ($)	Jul. 24, 2018 USD ($)	Aug. 23, 2017 BRL (R$)	Aug. 22, 2017 BRL (R$)	May 31, 2017 USD ($)	May 27, 2016 USD ($)	Mar. 13, 2015 USD ($)
Debt Instrument [Line Items]
Carrying amount of debt component									$ 1,056,415,000	$ 1,319,784,000
Interest expense									69,329,000	76,607,000	$ 60,246,000
Secured Debt
Debt Instrument [Line Items]
Interest expense									0	0	30,000
Unsecured Credit Agreement November 28, 2018 \| New Senior Revolving Credit Agreement
Debt Instrument [Line Items]
Maximum revolving credit																								$ 350,000,000
Line of credit facility, outstanding amount									0	0
Interest expense recorded									$ 3,600,000	$ 5,300,000	10,000,000
Debt instrument, renewal term					2 years
Repayment of outstanding borrowings	$ 300,000,000
Average interest rate									2.09%	2.88%
5.125% Senior Notes due May 27, 2021
Debt Instrument [Line Items]
Interest expense recorded									$ 5,800,000	$ 16,300,000	16,200,000
Stated interest rate									5.125%			5.125%							5.125%
Principal amount of notes																													$ 300,000,000
Repayments of outstanding borrowings			$ 256,000,000
5.125% Senior Notes due May 27, 2021 \| Cash Tender Offer
Debt Instrument [Line Items]
Stated interest rate																					5.125%
Principal amount of notes																					$ 300,000,000
Tendered amount on cash tender offer																				$ 44,000,000
5.125% Senior Notes due May 27, 2021 \| Level 2
Debt Instrument [Line Items]
Stated interest rate									5.125%			5.125%
5.375% Senior Notes due July 24, 2023
Debt Instrument [Line Items]
Interest expense recorded									$ 25,500,000	25,500,000	25,600,000
Stated interest rate									5.375%			5.375%													5.375%
Principal amount of notes																									$ 450,000,000
Redemption price as percentage of principal amount									101.00%
Carrying amount of debt component									$ 447,900,000																444,200,000
Debt issuance costs																									$ 5,800,000
5.375% Senior Notes due July 24, 2023 \| Level 2
Debt Instrument [Line Items]
Stated interest rate									5.375%			5.375%
3.750% Senior Notes due October 1, 2024
Debt Instrument [Line Items]
Interest expense recorded									$ 12,100,000	12,100,000	3,200,000
Stated interest rate						3.75%			3.75%			3.75%
Principal amount of notes						$ 300,000,000
Redemption price as percentage of principal amount						101.00%
Carrying amount of debt component						$ 296,100,000			$ 297,700,000
Debt issuance costs						$ 3,900,000
3.750% Senior Notes due October 1, 2024 \| Level 2
Debt Instrument [Line Items]
Stated interest rate									3.75%			3.75%
4.375% Senior Notes due December 15, 2025
Debt Instrument [Line Items]
Stated interest rate				4.375%					4.375%			4.375%
Principal amount of notes				$ 300,000,000
Redemption price as percentage of principal amount				101.00%
Carrying amount of debt component				$ 296,800,000					$ 297,500,000
Debt issuance costs				$ 3,200,000
Interest expense									$ 13,800,000	6,500,000	0
4.375% Senior Notes due December 15, 2025 \| Level 2
Debt Instrument [Line Items]
Stated interest rate									4.375%			4.375%
3.70% loan \| Secured Debt
Debt Instrument [Line Items]
Stated interest rate																														3.70%
Debt instrument gross amount																														$ 28,200,000
Outstanding balance of the secured loan arrangements									$ 0	0
3.44% loan
Debt Instrument [Line Items]
Outstanding balance of the secured loan arrangements									0	4,000,000
3.44% loan \| Secured Debt
Debt Instrument [Line Items]
Stated interest rate																												3.44%
Interest expense									40,000	300,000	500,000
Debt instrument gross amount																												$ 29,900,000
Outstanding balance of the secured loan arrangements									0	4,000,000
Book value of the fixed assets pledged										800,000
3.77% loan
Debt Instrument [Line Items]
Outstanding balance of the secured loan arrangements									5,900,000	9,600,000
3.77% loan \| Secured Debt
Debt Instrument [Line Items]
Stated interest rate																							3.77%
Interest expense									300,000	400,000	400,000
Debt instrument gross amount																							$ 15,000,000
Outstanding balance of the secured loan arrangements									5,900,000	9,600,000
Book value of the fixed assets pledged									100,000	1,200,000
3.89% Loan
Debt Instrument [Line Items]
Outstanding balance of the secured loan arrangements									3,800,000	6,300,000
3.89% Loan \| Secured Debt
Debt Instrument [Line Items]
Stated interest rate																						3.89%
Interest expense									200,000	300,000	300,000
Debt instrument gross amount																						$ 10,000,000
Outstanding balance of the secured loan arrangements									3,800,000	6,300,000
Book value of the fixed assets pledged									1,000,000	2,700,000
Unsecured Loan Agreement \| Short Term Loans \| Itau Unibanco S.A.
Debt Instrument [Line Items]
Maximum revolving credit								$ 3,600,000																			R$ 20,000,000
Line of credit facility, outstanding amount										3,800,000								R$ 20,000,000
Interest expense recorded									200,000	300,000	500,000
Line of credit, automatic renewal term								180 days
Unsecured Loan Agreement \| Short Term Loans \| Banco Daycoval S.A.
Debt Instrument [Line Items]
Maximum revolving credit		$ 3,600,000													R$ 20,000,000	$ 1,800,000	R$ 10,000,000
Line of credit facility, outstanding amount									3,600,000			R$ 20,000,000
Interest expense recorded									$ 200,000	0	0
Current interest rate									12.90%			12.90%
Unsecured Loan Agreement \| Short Term Loans \| Brazilian Interbank Offering Rate \| Itau Unibanco S.A.
Debt Instrument [Line Items]
Debt instrument, basis point									4.75%
Unsecured Loan Agreement \| Short Term Loans \| Brazilian Interbank Offering Rate \| Banco Daycoval S.A.
Debt Instrument [Line Items]
Debt instrument, basis point		3.66%
Unsecured Credit Agreement \| Intra-Day Overdraft Credit Line
Debt Instrument [Line Items]
Maximum revolving credit							$ 9,000,000						$ 10,800,000	R$ 60,000,000												R$ 50,000,000
Line of credit facility, outstanding amount									$ 0	0
Line of credit facility, fee percentage							1.75%
Line of credit facility, fee									$ 100,000	$ 100,000	$ 100,000