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Compensation - Summary of Compensation Expense Related to Amortization of LPUs Held by BGC Employees (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
LPU amortization | $ 16,740 | $ 19,524 | $ 33,834 | $ 35,833
Stated vesting schedule |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
LPU amortization | 16,701 | 18,459 | 33,775 | 34,736
Post-termination payout |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
LPU amortization | $ 39 | $ 1,065 | $ 59 | $ 1,097

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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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- 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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- Details
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- Details
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