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Equity - Additional Information (Detail) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Aug. 14, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 19, 2020
Shareholders Equity [line items]          
Subscribed and paid-in capital stock   1,112,810,192      
Price of the shares issued   R$ 25.48 R$ 26.60    
Common shares outstanding   46,518,315 55,725,974 57,870,520  
Shares held in treasury   26,780,298 26,780,298 (26,082,712)  
Average cost   R$ 18.12 R$ 18.12 R$ 18.49  
Increase in capital reserves   R$ 498,812      
Incurred costs directly attributable to issuing new shares   2,260      
Retention of profits and investments reserve   3,290,073 R$ 3,412,427    
Dividends payable   R$ 261,470 R$ 380,324    
Dividends per share R$ 0.20 R$ 0.24 R$ 0.70    
Dividends paid R$ 217,382        
Rights Outstanding         2,108,542
Top of range [member]          
Shareholders Equity [line items]          
Common shares authorized   1,600,000,000