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5. TRADE RECEIVABLES (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]    
Trade receivables R$ 2,197,078 R$ 1,904,630
Third parties    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 2,273,669 1,947,575
Third parties | Current    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 1,391,839 1,381,255
Third parties | Past-due up to 180 days    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 310,106 245,012
Third parties | Past-due over 180 days    
Disclosure of fair value measurement of assets [line items]    
Trade receivables R$ 571,724 R$ 321,308