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INVESTMENTS IN NON-CONSOLIDATED COMPANIES INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Investment in Usinas) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Equity | $ 5,852,771 | $ 5,166,593 | $ 4,802,997 | $ 5,634,703
Investments in non-consolidated companies | 478,348 | 418,379 | 250,412 |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Equity | $ 4,164,086 | 4,153,000 |  |
Proportion of ownership interest in associate | 20.47% |  |  |
Investments in non-consolidated companies | $ 466,299 | $ 411,134 | $ 239,960 |
Purchase price allocation | 78,688 |  |  |
Goodwill | 314,218 |  |  |
Impairment loss | (778,870) |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium S.A. |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Investments in non-consolidated companies | $ 852,263 |  |  |

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