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Earnings Per Share - Schedule of Net Income Per Share (Detail) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net loss attributable to BBGI stockholders $ (10,555,392) $ (8,836,561)
Weighted-average shares outstanding:    
Basic weighted shares outstanding 29,302,799 27,947,577
Effect of dilutive restricted stock units and restricted stock   0
Diluted 29,302,799 27,947,577
Net loss per Class A and Class B common share – basic and diluted $ (0.36) $ (0.32)