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RELATED-PARTY TRANSACTIONS - Key Management compensation and other information from related parties (Details) R$ in Thousands | 12 Months Ended
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Dec. 31, 2021 BRL (R$) EquityInstruments | Dec. 31, 2020 BRL (R$) EquityInstruments | Dec. 31, 2019 EquityInstruments
RELATED PARTY TRANSACTIONS |  |  |
Cost of social charges, related to the management | R$ | R$ 23,266 | R$ 27,830 |
Key Management personnel (Board of Directors and executive officers) |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Key management salaries, variable compensation and benefits | R$ | 61,747 | 33,773 |
Contributions to management's defined contribution pension plans | R$ | 1,932 | 1,416 |
Key management long-term incentive plans | R$ | 19,637 | 19,328 |
Fundacao Gerdau, Instituto Gerdau and Fundacao Ouro Branco |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Contributions to defined contribution pension plans | R$ | 35,595 | R$ 104,322 |
Brasil ao Cubo Construo modular Ltda |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Other non-current assets related party transaction | R$ | R$ 91,666 |  |
Restricted and Performance Shares | Key Management personnel (Board of Directors and executive officers) |  |  |
Restricted shares granted to Management |  |  |
Balance, beginning of year | EquityInstruments | 6,456,248 | 6,717,872 | 6,375,547
Granted | EquityInstruments | 709,990 | 733,218 | 1,083,116
Exercised | EquityInstruments | (3,453,802) | (937,325) | (627,076)
Cancelled | EquityInstruments |  | (64,112) | (38,553)
Others | EquityInstruments |  | (6,595) | 75,162
Balance, end of year | EquityInstruments | 3,712,436 | 6,456,248 | 6,717,872

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- Definition The amount of compensation to key management personnel in the form of other long-term employee benefits. [Refer: Other long-term employee benefits; Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_53&doctype=Standard -URIDate 2021-03-24 + Details
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