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19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of transactions between related parties [line items] |  |  |
Related party sales | R$ 1,278,751 | R$ 880,145 | R$ 878,992
Related party purchases | (1,418,282) | (1,176,930) | (1,099,851)
Relared party finance income and costs, net | 48,796 |  | 57,779
Foreign exchange and monetary variation, net | 13,611 |  | (18,398)
Related party transactions, net | (77,124) |  | (181,478)
AssociatesMember | Discontinued operations [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales |  |  | 43,250
Related party purchases |  |  | (138)
Relared party finance income and costs, net |  |  | (130)
Related party transactions, net |  |  | 42,982
Arvedi Metalfer do Brasil | AssociatesMember |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales | 100,608 |  |
Relared party finance income and costs, net | 234 |  |
Related party transactions, net | 100,842 |  |
Arvedi Metalfer do Brasil S,A, | AssociatesMember |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales |  |  | 31,026
Relared party finance income and costs, net |  |  | 2,995
Related party transactions, net |  |  | 34,021
Joint Venture/Joint Operation |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales | 414 | 2,604 | 5,057
Related party purchases | (1,307,694) | (1,125,228) | (1,082,272)
Relared party finance income and costs, net | 33,911 | 53,261 | 55,758
Related party transactions, net | (1,273,369) | (1,069,363) | (1,021,457)
Joint Venture/Joint Operation | Ita Energetica |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party purchases |  | (32,275) | (32,363)
Related party transactions, net |  | (32,275) | (32,363)
Joint Venture/Joint Operation | MRS Logistica |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party purchases | (1,111,695) | (934,279) | (903,030)
Relared party finance income and costs, net | (16,092) |  |
Related party transactions, net | (1,127,787) | (934,279) | (903,030)
Joint Venture/Joint Operation | CBSI - Companhia Brasileira de Servicos e Infraestrutura |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales | 47 | 55 | 18
Related party purchases | (180,332) | (150,758) | (138,374)
Related party transactions, net | (180,285) | (150,703) | (138,356)
Joint Venture/Joint Operation | Transnordestina Logistica S,A |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales | 367 | 2,549 | 5,039
Related party purchases | (15,667) | (7,916) | (8,505)
Relared party finance income and costs, net | 50,003 | 53,261 | 55,758
Related party transactions, net | 34,703 | 47,894 | 52,292
Other Related Parties |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales | 1,177,729 | 874,881 | 799,659
Related party purchases | (110,588) | (51,702) | (17,441)
Relared party finance income and costs, net | 14,651 | 6,290 | (844)
Foreign exchange and monetary variation, net | 13,611 |  | (18,398)
Related party transactions, net | 1,095,403 | 829,469 | 762,976
Other Related Parties | Fundacao CSN |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party purchases |  | (4,045) | (4,045)
Related party transactions, net |  | (4,045) | (4,045)
Other Related Parties | Banco Fibra |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Relared party finance income and costs, net | 14,651 | (844) | (844)
Foreign exchange and monetary variation, net | 13,611 | (18,398) | (18,398)
Related party transactions, net | 28,262 | (19,242) | (19,242)
Other Related Parties | Usiminas |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales |  | 17,027 | 17,027
Related party purchases | (382) | (6,026) | (6,026)
Related party transactions, net | (382) | 11,001 | 11,001
Other Related Parties | Panatlantica |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales | 1,174,984 | 779,503 | 779,503
Related party purchases | (94,515) |  |
Related party transactions, net | 1,080,469 | 779,503 | 779,503
Other Related Parties | Ibis Participacoes e Servicos |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales |  | 47 | 47
Related party purchases | (4,501) | (7,370) | (7,370)
Related party transactions, net | (4,501) | (7,323) | R$ (7,323)
Other Related Parties | Other |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales | 2,745 | 3,082 |
Related party purchases | (11,190) |  |
Related party transactions, net | R$ (8,445) | 3,082 |
Other Related Parties | Partfib Projetos Imobiliarios |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party sales |  | 2,821 |
Related party transactions, net |  | 2,821 |
Other Related Parties | Vicunha Textil S.A. |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party purchases |  | (232) |
Related party transactions, net |  | (232) |
Other Related Parties | Vicunha Servicos Ltda. |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party purchases |  | (61) |
Related party transactions, net |  | R$ (61) |

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