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Borrowings (Details Text) (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jul. 31, 2016
Borrowings (Details Text)        
Borrowings R$ 0 R$ 205,204    
Borrowings, interest rate 110.00%      
Foreign currency | United States of America, Dollars        
Borrowings (Details Text)        
Borrowings     R$ 21,766 R$ 40,000
Equivalent to approximately R$        
Borrowings (Details Text)        
Borrowings     R$ 70,000 R$ 129,390