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20. Provision, Contingencies, and Commitments (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfEscrowDepositsLineItems [Line Items]    
Total non-current assets R$ 822,660 R$ 778,770
Tax matters    
SummaryOfEscrowDepositsLineItems [Line Items]    
Total non-current assets 659,062 643,423
Labor litigation    
SummaryOfEscrowDepositsLineItems [Line Items]    
Total non-current assets 71,074 70,392
Civil and other    
SummaryOfEscrowDepositsLineItems [Line Items]    
Total non-current assets R$ 92,524 R$ 64,955