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Compensation - Summary of Compensation Expense Related to Amortization of LPUs Held by BGC Employees (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LPU amortization	$ 19,524	$ 10,689	$ 35,833	$ 13,734
Stated vesting schedule [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LPU amortization	18,459	10,686	34,736	14,192
Post-termination payout [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LPU amortization	$ 1,065	$ 3	$ 1,097	$ (458)

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- Definition

Share based compensation arrangement by share based payment award limited partners capital units amortization.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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

X

- Details

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

X

- Details

Name:	us-gaap_PlanNameAxis=bgcp_PostTerminationPayoutMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: