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Related Party Transactions - Loans, Forgivable Loans and Other Receivables from Employees and Partners, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |
Loans, forgivable loans and other receivables from employees and partners, net | $ 319,612 | $ 286,967 |
Employee Loans |  |  |
Related Party Transaction [Line Items] |  |  |
Loans, forgivable loans and other receivables from employees and partners, net | 319,600 | 287,000 |
Compensation expense related to employee loans | 49,500 | 217,700 | $ 67,000
Interest income | $ 7,500 | $ 10,000 | $ 8,800

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- Definition The compensation expense recognized during the period related to employee loans. + References No definition available. + Details
Name: | bgcp_EmployeeLoanExpense
Namespace Prefix: | bgcp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Loans forgivable loans and other receivables from employees and partners. + References No definition available. + Details
Name: | bgcp_LoansForgivableLoansAndOtherReceivablesFromEmployeesAndPartners
Namespace Prefix: | bgcp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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Balance Type: | credit
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

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |