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Equity - Additional Information (Detail) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 24, 2021
Aug. 12, 2020
Feb. 19, 2020
Shareholders Equity [line items]            
Subscribed and paid-in capital stock 1,115,005,712 1,112,810,192        
Common shares authorized 1,600,000,000          
Price of the shares issued R$ 23.74 R$ 25.48        
Common shares outstanding 47,413,094 46,518,315 55,725,974      
Shares held in treasury 24,739,626 26,780,298 26,780,298      
Average cost R$ 19.77 R$ 18.12 R$ 18.12      
Increase in capital reserves R$ 498,812       R$ 1,691 R$ 53,072
Incurred costs directly attributable to issuing new shares 2,260          
Retention of profits and investments reserve 3,658,265 R$ 3,290,073        
Dividends payable   R$ 261,470        
Dividends per share   R$ 0.24        
Rights Outstanding       70,939 86,978 2,108,542
Proposed dividends payable R$ 479,748          
Proposed dividends payable per share R$ 0.44