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Financial Guarantee Liability - Provisions for Risk Sharing (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Guarantees [Abstract]
Increase (decrease) to financial guarantee liability	$ 7	$ (5)
Decrease (increase) to credit enhancement asset	10	4
Total provision for risk-sharing obligations	$ 17	$ (1)

X

- Definition

Decrease (increase) to credit enhancement asset.

+ References

No definition available.

+ Details

Name:	bgcp_DecreaseIncreaseToCreditEnhancementAsset
Namespace Prefix:	bgcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Increase (decrease) to financial guarantee liability.

+ References

No definition available.

+ Details

Name:	bgcp_IncreaseDecreaseToFinancialGuaranteeLiability
Namespace Prefix:	bgcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Provision for risk-sharing obligations.

+ References

No definition available.

+ Details

Name:	bgcp_ProvisionForRiskSharingObligations
Namespace Prefix:	bgcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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