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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Investment in Usinas) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Equity | $ 7,484,576 | $ 6,543,604 | $ 5,852,771 | $ 5,166,593 | $ 4,802,997
Investments in non-consolidated companies | 495,241 |  | 478,348 | 418,379 |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Equity | $ 3,681,815 |  | 4,164,000 |  |
Proportion of ownership interest in associate | 20.43% |  |  |  |
Investments in non-consolidated companies | $ 480,084 |  | $ 466,299 | $ 411,134 |
Purchase price allocation | 71,013 |  |  |  |
Goodwill | 268,255 |  |  |  |
Impairment loss | (611,232) |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium S.A. |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Investments in non-consolidated companies | $ 752,048 |  |  |  |

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