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Equity - Additional Information (Detail) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Aug. 20, 2018
Jan. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shareholders Equity [line items]          
Subscribed and paid-in capital stock     556,405,096    
Price of the shares issued     R$ 53.20    
Common shares outstanding     27,862,987 28,935,260 28,944,097
Shares held in treasury     13,390,149 13,041,356 13,131,356
Average cost     R$ 36.25 R$ 36.98 R$ 36.85
Increase in capital reserves     R$ 498,812    
Incurred costs directly attributable to issuing new shares     2,260    
Retention of profits and investments reserve   R$ 2,500,471 3,412,427 R$ 3,000,707  
Dividends payable     R$ 380,324 R$ 489,027  
Dividends per share R$ 0.56   R$ 0.70 R$ 0.90  
Dividends paid R$ 304,241        
Top of range [member]          
Shareholders Equity [line items]          
Common shares authorized     800,000,000