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19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
DisclosureOfRelatedpartyBalancesAndTransactionsLineItems [Line Items] |  |
Proposed dividends | R$ 477,553 | R$ 0
Vicunha Acos |  |
DisclosureOfRelatedpartyBalancesAndTransactionsLineItems [Line Items] |  |
Proposed dividends | 439,913 |
Rio Iaco Participacoes S.A. |  |
DisclosureOfRelatedpartyBalancesAndTransactionsLineItems [Line Items] |  |
Proposed dividends | R$ 37,640 |

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- Definition The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_137_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 10 -IssueDate 2018-01-01 -Paragraph 13 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=10&date=2018-03-01&anchor=para_13&doctype=Standard -URIDate 2018-03-16 + Details
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