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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 | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
LPU amortization | $ 19,862 | $ 18,455 | $ 53,696 | $ 54,288
Stated vesting schedule |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
LPU amortization | 19,880 | 18,461 | 53,655 | 53,197
Post-termination payout |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
LPU amortization | $ (18) | $ (6) | $ 41 | $ 1,091

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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
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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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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |