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Provision for contingencies (Details 1) (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current provisions [abstract]      
Civil R$ 4,895 R$ 4,326 R$ 555
Labor 318 322 125
Total R$ 5,213 R$ 4,648 R$ 680