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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 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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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
Liabilities, fair value | $ 39,791 | $ 42,159
Minimum [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
Minimum [Member] | Discount Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.068 | 0.092
Minimum [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 | 0.39 | 0.70
Maximum [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
Maximum [Member] | Discount Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.103 | 0.103
Maximum [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 | 1 | 1
Weighted Average [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
Weighted Average [Member] | Discount Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.095 | 0.098
Weighted Average [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 | 0.829 | 0.902

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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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=117815213&loc=d3e19207-110258 + Details
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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 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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