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19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	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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- References

No definition available.

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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

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