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9. Trade receivables (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfTradeReceivablesLineItems [Line Items]    
Current R$ 1,471,668 R$ 1,337,503
Past-due 4,067,035 3,888,043
Total 5,538,703 5,225,546
Up to 30 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 287,173 263,157
From 31 to 60 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 118,179 148,927
From 61 to 90 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 73,989 53,268
From 91 to 120 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 52,477 109,138
From 121 to 180 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 105,952 124,001
From 181 to 360 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due 147,699 203,837
Over 360 days    
SummaryOfTradeReceivablesLineItems [Line Items]    
Past-due R$ 3,281,566 R$ 2,985,715