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Compensation - Summary of Compensation Expense Related to Amortization of LPUs Held by BGC Employees (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
LPU amortization | $ 78,596 | $ 74,282 | $ 41,721
Stated vesting schedule |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
LPU amortization | 78,535 | 73,034 | 42,060
Post-termination payout |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
LPU amortization | $ 61 | $ 1,248 | $ (339)

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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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Balance Type: | na
Period Type: | duration

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

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