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Subscription warrants - indemnification - Additional information (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Jan. 31, 2014
Dec. 31, 2019
Dec. 31, 2018
Feb. 19, 2020
Subscription warrants - indemnification [abstract]        
Subscription warrants shares issued 7      
Maximum number of shares to be issued - subscription warrants 6,411,244      
Subscription warrants, shares   5,192,919 4,824,238  
Subscription warrants - indemnification   R$ 130,657 R$ 123,095  
Maximum number of shares available for issue - subscription warrants   5,920,425 (5,976,316)  
Rights outstanding       2,108,542