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Earnings Per Share - Additional Information (Detail) - shares shares in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) | 143.5 | 187.4 | 98.2 | 2.9
Limited Partnership Unit |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) | 137.6 | 184.7 | 98.1 |
Contingent Class A Common Stock | BGC Holdings Partnership Unit |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) |  |  | 37.5 | 28.4
Contingent Class A Common Stock | Limited Partnership Unit |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) |  |  | 37.5 | 28.4
Contingent Class A Common Stock | N Units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) |  |  | 37.5 | 28.4
Restricted Stock Units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) |  | 2.7 | 0.1 |
Restricted Stock Units | Contingent Class A Common Stock |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) |  |  | 37.5 | 28.4
Other Antidilutive Securities |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) | 5.9 |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + 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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