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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Investment in Usinas) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Equity | $ 8,443,153 | $ 7,714,873 | $ 7,484,576 | $ 5,852,771
Investments in non-consolidated companies | 471,306 | 513,648 | 495,241 |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Equity | $ 2,860,944 | 3,484,000 |  |
Proportion of ownership interest in associate | 20.41% |  |  |
Investments in non-consolidated companies | $ 422,948 | $ 486,643 | $ 480,084 |
Purchase price allocation | 46,664 |  |  |
Goodwill | 200,018 |  |  |
Impairment | (407,533) |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium S.A. |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Investments in non-consolidated companies | $ 583,799 |  |  |

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