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Schedule I - Parent Company Only - Organization and Basis of Presentation - Additional Information (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Description Of Business [Line Items] |  |  |
Dividends declared per share to BGC Class A and Class B common stockholders (in dollars per share) | $ 0.04 | $ 0.17 | $ 0.56
Dividends paid per share to BGC Class A and Class B common stockholders (in dollars per share) | 0.04 | 0.17 | 0.56
Parent Company |  |  |
Description Of Business [Line Items] |  |  |
Dividends declared per share to BGC Class A and Class B common stockholders (in dollars per share) | 0.04 | 0.17 | 0.56
Dividends paid per share to BGC Class A and Class B common stockholders (in dollars per share) | $ 0.04 | $ 0.17 | $ 0.56

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