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Fair Value of Financial Assets and Liabilities - Quantitative Information about Level 3 Fair Value Measurements on Recurring Basis (Detail) $ in Thousands	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Fair Value by Fair Value Hierarchy Level [Extensible List]	us-gaap:FairValueInputsLevel3Member	us-gaap:FairValueInputsLevel3Member
Accounts Payable, Accrued and Other Liabilities [Member] | Contingent Consideration [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, fair value	$ 42,139	$ 45,984
Accounts Payable, Accrued and Other Liabilities [Member] | Minimum [Member] | Contingent Consideration [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
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Accounts Payable, Accrued and Other Liabilities [Member] | Minimum [Member] | Contingent Consideration [Member] | Discount Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	9.2	9.2
Accounts Payable, Accrued and Other Liabilities [Member] | Minimum [Member] | Contingent Consideration [Member] | Probability of Meeting Earnout and Contingencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	57	75
Accounts Payable, Accrued and Other Liabilities [Member] | Maximum [Member] | Contingent Consideration [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Valuation Technique [Extensible List]	bgcp:PresentValueOfExpectedPaymentsApproachValuationTechniqueMember	bgcp:PresentValueOfExpectedPaymentsApproachValuationTechniqueMember
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	10.3	10.3
Accounts Payable, Accrued and Other Liabilities [Member] | Maximum [Member] | Contingent Consideration [Member] | Probability of Meeting Earnout and Contingencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	100	100
Accounts Payable, Accrued and Other Liabilities [Member] | Weighted Average [Member] | Contingent Consideration [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Valuation Technique [Extensible List]	bgcp:PresentValueOfExpectedPaymentsApproachValuationTechniqueMember	bgcp:PresentValueOfExpectedPaymentsApproachValuationTechniqueMember
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	9.7	9.6
Accounts Payable, Accrued and Other Liabilities [Member] | Weighted Average [Member] | Contingent Consideration [Member] | Probability of Meeting Earnout and Contingencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	89	95

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- Definition

Indicates level within fair value hierarchy of contingent consideration liability from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Value of input used to measure contingent consideration liability from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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+ References

No definition available.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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