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30. Segment Information (Details 3) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue R$ 80,007,422 R$ 77,352,955 R$ 75,655,274
Brazil      
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue 78,763,771 76,283,061 74,337,803
Mexico      
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue 190,205 183,124 215,141
Uruguay      
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue 33,873 33,782 37,938
Venezuela      
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue 54,788 25,393 158,020
Other Latin American countries      
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue 427,875 448,814 392,748
United States      
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue 292,709 158,280 166,277
Far East      
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue 72,469 57,662 190,160
Europe      
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue 119,097 97,261 101,931
Others      
SummaryOfSegmentInformationLineItems [Line Items]      
Revenue R$ 52,635 R$ 65,578 R$ 55,256