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Financial risk management (Details 1) (Detail)
R$ in Thousands
Dec. 31, 2016
BRL (R$)
Derivative financial instruments  
Fair value R$ (6,613)
Maturity: Jan-2017  
Derivative financial instruments  
Fair value (5,275)
Maturity: Mar-2017  
Derivative financial instruments  
Fair value (1,338)
Foreign exchange and interest | Maturity: Jan-2017  
Derivative financial instruments  
Notional value 129,480
Fair value 132,761
Foreign exchange and interest | Maturity: Mar-2017  
Derivative financial instruments  
Notional value 70,000
Fair value 71,537
Interbank Deposit Certificate (CDI) | Maturity: Jan-2017  
Derivative financial instruments  
Notional value (129,480)
Fair value (138,036)
Interbank Deposit Certificate (CDI) | Maturity: Mar-2017  
Derivative financial instruments  
Notional value (70,000)
Fair value R$ (72,875)