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Compensation - Units Redeemed in Connection with Issuance of Class A Common Stock (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of units redeemed (in shares) | 43,036,797 | 64,764 | 43,723,341 | 356,485
BGC Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of units redeemed (in shares) | 11,589,383 | 38,552 | 11,635,988 | 187,832
Newmark Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of units redeemed (in shares) | 31,447,414 | 26,212 | 32,087,353 | 168,653

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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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