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5. TRADE RECEIVABLES (Details) - 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
Other receivables 79,137 92,586
Trade and other receivables 2,276,215 1,997,216
Third parties    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 2,273,669 1,947,575
Third parties | Domestic market    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 1,290,823 1,027,639
Third parties | Foreign market    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 982,846 919,936
Allowance for doubtful accounts    
Disclosure of fair value measurement of assets [line items]    
Trade receivables (191,979) (172,782)
Subtotal    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 2,081,690 1,774,793
Related parties    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 115,388 129,837
Dividends receivable    
Disclosure of fair value measurement of assets [line items]    
Other receivables [1] 41,528 37,679
Advances to employees    
Disclosure of fair value measurement of assets [line items]    
Other receivables 33,942 34,607
Other receivables    
Disclosure of fair value measurement of assets [line items]    
Other receivables R$ 3,667 R$ 20,300
[1] Refers mainly to dividends from CSN Mineracao S.A. totaling R$ 837,084 received in February 2018.