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Borrowings (Details 1) (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Borrowings    
Average annual interest rate%   110.00%
Borrowings R$ 205,204 R$ 0
Bank Borrowings (A) | Fixed interest rates    
Borrowings    
Average annual interest rate% 2.36365%  
Maturity January 2017  
Borrowings R$ 133,874  
Bank Borrowings (B) | Fixed interest rates    
Borrowings    
Average annual interest rate% 2.8645%  
Maturity March 2017  
Borrowings R$ 71,330