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Schedule I - Parent Company Only - Organization and Basis of Presentation - Additional Information (Detail) - $ / shares
 12 Months Ended
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