Debt instrument settlement date.

No definition available.

Name:	bgcp_DebtInstrumentSettlementDate
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- Definition

Fixed assets pledged for secured loan value.

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No definition available.

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- Definition

Redemption price of debt instrument as a percentage of the principal amount.

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No definition available.

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- Definition

Tendered amount on cash tender offer.

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No definition available.

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- Definition

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

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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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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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The average effective interest rate during the reporting period.

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

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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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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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

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

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No definition available.

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

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

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

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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.

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No definition available.

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Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.

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Date the credit facility terminates, in CCYY-MM-DD format.

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

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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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The cash inflow from a borrowing supported by a written promise to pay an obligation.

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

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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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)									3 Months Ended								12 Months Ended
	Jul. 14, 2020 USD ($)	Jul. 10, 2020 USD ($)	Sep. 27, 2019 USD ($)	Apr. 19, 2019 USD ($)	Apr. 08, 2019 USD ($)	Jul. 19, 2018 USD ($)	Aug. 23, 2017 USD ($)	Aug. 22, 2017 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2020 BRL (R$)	Aug. 14, 2020	Aug. 11, 2020 USD ($)	Aug. 05, 2020 USD ($)	Dec. 31, 2019 BRL (R$)	Nov. 28, 2018 USD ($)	Jul. 24, 2018 USD ($)	Sep. 08, 2017 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									$ 1,319,784,000				$ 1,147,649,000				$ 1,319,784,000	$ 1,147,649,000
Interest expense									21,811,000	$ 19,665,000	$ 17,625,000	$ 17,506,000	16,354,000	$ 15,403,000	$ 15,136,000	$ 13,353,000	$ 76,607,000	60,246,000	$ 42,494,000
Unsecured Credit Agreement September 8, 2017 [Member]
Debt Instrument [Line Items]
Repayment of term loan																			195,000,000.0
Line of credit facility, outstanding amount																			0
Unsecured Credit Agreement September 8, 2017 [Member] \| Senior Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum revolving credit																												$ 400,000,000.0
Credit agreement maturity date																	Sep. 08, 2019
Interest expense recorded																	$ 0	0	1,000,000.0
Unsecured Credit Agreement November 28, 2018 [Member] \| New Senior Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum revolving credit																										$ 350,000,000.0
Credit agreement maturity date																	Nov. 28, 2018
Line of credit facility, outstanding amount									$ 0				68,900,000				$ 0	68,900,000
Interest expense recorded																	$ 5,300,000	10,000,000.0	300,000
Repayment of outstanding borrowings	$ 225,000,000.0
Deferred financing costs													$ 1,100,000					$ 1,100,000
Average interest rate																	2.88%	3.88%
5.125% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense recorded																	$ 16,300,000	$ 16,200,000	16,200,000
Stated interest rate									5.125%				5.125%				5.125%	5.125%			5.125%	5.125%			5.125%
Principal amount of notes																																$ 300,000,000.0
Debt instrument, periodic interest payment description																	payable in cash on May 27 and November 27 of each year, commencing November 27, 2016
Senior Notes maturity date																	May 27, 2021
Redemption price as percentage of principal amount																	101.00%
Carrying amount of debt component									$ 255,600,000								$ 255,600,000															295,800,000
Debt issuance costs																																$ 4,200,000
5.125% Senior Notes [Member] \| Cash Tender Offer [Member]
Debt Instrument [Line Items]
Stated interest rate																								5.125%
Principal amount of notes																								$ 300,000,000.0
Tendered amount on cash tender offer																							$ 44,000,000.0
Debt instrument settlement date																	Aug. 14, 2020
5.125% Senior Notes [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Stated interest rate									5.125%								5.125%				5.125%
5.375% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense recorded																	$ 25,600,000	$ 25,600,000	11,000,000.0
Stated interest rate									5.375%				5.375%				5.375%	5.375%			5.375%				5.375%		5.375%
Principal amount of notes																											$ 450,000,000.0
Debt instrument, periodic interest payment description																	payable in cash on January 24 and July 24 of each year, commencing January 24, 2019. The 5.375% Senior Notes will mature on July 24, 2023.
Senior Notes maturity date																	Jul. 24, 2023
Carrying amount of debt component									$ 446,600,000								$ 446,600,000										444,200,000
Debt issuance costs																											$ 5,800,000
Redemption price as percentage of principal amount																	101.00%
5.375% Senior Notes [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Stated interest rate									5.375%								5.375%				5.375%
3.750% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense recorded																	$ 12,100,000	$ 3,200,000	0
Stated interest rate			3.75%						3.75%				3.75%				3.75%	3.75%			3.75%				3.75%
Principal amount of notes			$ 300,000,000.0
Debt instrument, periodic interest payment description																	payable in cash on April 1 and October 1 of each year, commencing April 1, 2020.
Senior Notes maturity date			Oct. 01, 2024
Carrying amount of debt component			$ 296,100,000						$ 296,900,000								$ 296,900,000
Debt issuance costs			$ 3,900,000
Redemption price as percentage of principal amount			101.00%
3.750% Senior Notes [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Stated interest rate									3.75%								3.75%				3.75%
4.375% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		4.375%							4.375%				4.375%				4.375%	4.375%			4.375%				4.375%
Principal amount of notes		$ 300,000,000.0
Debt instrument, periodic interest payment description																	payable in cash on June 15 and December 15 of each year, commencing December 15, 2020. The 4.375% Senior Notes will mature on December 15, 2025.
Senior Notes maturity date		Dec. 15, 2025
Redemption price as percentage of principal amount		101.00%
Carrying amount of debt component		$ 296,800,000							$ 297,000,000.0								$ 297,000,000.0
Debt issuance costs		$ 3,200,000
Interest expense																	$ 6,500,000	$ 0	0
4.375% Senior Notes [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Stated interest rate									4.375%								4.375%				4.375%
8.375% Senior Notes [Member]
Debt Instrument [Line Items]
Interest expense recorded																	$ 0	0	11,100,000
Stated interest rate									8.375%								8.375%				8.375%
Principal amount of notes									$ 240,000,000.0								$ 240,000,000.0
Debt instrument, periodic interest payment description																	semi-annually
Repayments of outstanding borrowings						$ 240,000,000.0
3.70% [Member]
Debt Instrument [Line Items]
Outstanding balance of the secured loan arrangements									0				$ 0				$ 0	0
3.70% [Member] \| Secured Loan Arrangements [Member]
Debt Instrument [Line Items]
Stated interest rate																																	3.70%
Senior Notes maturity date																	Mar. 13, 2019
Interest expense																	$ 0	30,000	300,000
Debt instrument gross amount																																	$ 28,200,000
3.44% [Member]
Debt Instrument [Line Items]
Outstanding balance of the secured loan arrangements									4,000,000.0				11,700,000				$ 4,000,000.0	11,700,000
3.44% [Member] \| Secured Loan Arrangements [Member]
Debt Instrument [Line Items]
Stated interest rate																															3.44%
Senior Notes maturity date																	May 31, 2021
Interest expense																	$ 300,000	500,000	800,000
Debt instrument gross amount																															$ 29,900,000
Book value of the fixed assets pledged									800,000				2,300,000				800,000	2,300,000
3.77% [Member]
Debt Instrument [Line Items]
Outstanding balance of the secured loan arrangements									9,600,000				13,200,000				9,600,000	13,200,000
3.77% [Member] \| Secured Loan Arrangements [Member]
Debt Instrument [Line Items]
Stated interest rate					3.77%
Senior Notes maturity date					Apr. 08, 2023
Interest expense																	400,000	400,000		$ 0
Debt instrument gross amount					$ 15,000,000.0
Book value of the fixed assets pledged									1,200,000				8,100,000				1,200,000	8,100,000
3.89% [Member]
Debt Instrument [Line Items]
Outstanding balance of the secured loan arrangements									6,300,000				8,800,000				6,300,000	8,800,000
3.89% [Member] \| Secured Loan Arrangements [Member]
Debt Instrument [Line Items]
Stated interest rate				3.89%
Senior Notes maturity date				Apr. 19, 2023
Interest expense																	300,000	300,000	0
Debt instrument gross amount				$ 10,000,000.0
Book value of the fixed assets pledged									2,700,000				5,700,000				2,700,000	5,700,000
Unsecured Loan Agreement [Member] \| Short Term Loans [Member]
Debt Instrument [Line Items]
Maximum revolving credit								$ 3,800,000																						R$ 20,000,000.0
Credit agreement maturity date								Aug. 19, 2021
Line of credit facility, outstanding amount									$ 3,800,000				5,000,000.0				3,800,000	5,000,000.0			R$ 20,000,000.0				R$ 20,000,000.0
Interest expense recorded																	$ 300,000	500,000	600,000
Line of credit facility, description																	Borrowings under this agreement bear interest at the Brazilian Interbank offering rate plus 3.30%.
Current interest rate									5.30%								5.30%				5.30%
Debt instrument, description of reference rate																	Brazilian Interbank offering rate
Unsecured Loan Agreement [Member] \| Short Term Loans [Member] \| Brazilian Interbank Offering Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis point								3.30%
Unsecured Credit Agreement [Member] \| Intra-Day Overdraft Credit Line [Member]
Debt Instrument [Line Items]
Maximum revolving credit							$ 9,600,000																						R$ 50,000,000.0
Credit agreement maturity date							Mar. 09, 2021
Line of credit facility, outstanding amount									$ 0				$ 0				$ 0	0
Line of credit facility, fee percentage							1.28%
Line of credit facility, fee																	$ 100,000	$ 100,000	100,000
Newmark [Member] \| Unsecured Credit Agreement September 8, 2017 [Member] \| Senior Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Proceeds from notes payable																			$ 195,000,000.0