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Provision for contingencies (Detils Text) (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Provision For Contingencies Details Text [Abstract]      
Tax lawsuits classified as possible losses, for which no provision was recognized R$ 22,160 R$ 25,800  
Tax lawsuits classified as possible losses   R$ 29,726 R$ 25,800