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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Narrative) (Details) $ / shares in Units, $ in Thousands, shares in Millions |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2018 term member vice_president | Oct. 30, 2014 shares | Jan. 15, 2012 shares | Dec. 31, 2018 USD ($) $ / shares MW shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2018 R$ / shares | Jan. 01, 2018 USD ($) | Dec. 31, 2017 R$ / shares | Dec. 31, 2015 USD ($)
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Fair value of investments in associates for which there are quoted market prices |  |  |  | $ 736,500 |  |  |  |  |  |
Investments in associates |  |  |  | 480,100 |  |  |  |  |  |
Revenue |  |  |  | 11,454,807 | $ 9,700,296 | $ 7,223,975 |  |  |  |
Equity |  |  |  | 7,484,576 | 5,852,771 | $ 5,166,593 |  | $ 6,543,604 |  | $ 4,802,997
Nippon Steel & Sumitomo Metal Corporation Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of shares acquired (shares) | shares |  |  | 6.7 |  |  |  |  |  |  |
Caixa de Previdência dos Funcionários |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of shares acquired (shares) | shares |  | 51.4 |  |  |  |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 3,766,000 | 3,368,000 |  |  |  |  |
Profit from continuing operations |  |  |  | 193,000 |  |  |  |  |  |
Equity |  |  |  | $ 3,681,815 | $ 4,164,000 |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium Investments S.à r.l., Ternium Argentina S.A. and Prosid Investments S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 20.50% |  |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Previdência Usiminas |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 68.60% |  |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | T/T Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 47.10% |  |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 39.50% |  |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Tenaris |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 7.50% |  |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Nippon Steel & Sumitomo Metal Corporation Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 45.90% |  |  |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Control Group |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 7.00% |  |  |  |  |  |
Techgen S.A. de C.V. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of megawatts (MW) | MW |  |  |  | 900 |  |  |  |  |  |
Subordinated liabilities |  |  |  | $ 151,600 |  |  |  |  |  |
Techgen S.A. de C.V. | Ternium S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  | 48.00% |  |  |  |  |  |
Proportion of ownership interest in associate's power supply |  |  |  | 78.00% |  |  |  |  |  |
Techgen S.A. de C.V. | Tecpetrol International S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  | 30.00% |  |  |  |  |  |
Techgen S.A. de C.V. | Tenaris Investments S.à.r.l. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  | 22.00% |  |  |  |  |  |
Proportion of ownership interest in associate's power supply |  |  |  | 22.00% |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Share price (per share) | (per share) |  |  |  | $ 2.95 | $ 3.27 |  | R$ 11.44 |  | R$ 10.83 |
Ordinary shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium Investments S.à r.l., Ternium Argentina S.A. and Prosid Investments S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (shares) | shares |  |  |  | 242.6 |  |  |  |  |  |
Ordinary shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Previdência Usiminas |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (shares) | shares |  |  |  | 483.6 |  |  |  |  |  |
Preferred shares |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Share price (per share) | (per share) |  |  |  | $ 2.38 | $ 2.75 |  | R$ 9.22 |  | R$ 9.10 |
Preferred shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium Investments S.à r.l., Ternium Argentina S.A. and Prosid Investments S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (shares) | shares |  |  |  | 8.5 |  |  |  |  |  |
Previdência Usiminas | Tenrium Investments S.a r.l. & Nippon Steel & Sumitomo Metal Corporation |  |  |  |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |
Alternating time interval to nominate CEO | 4 years |  |  |  |  |  |  |  |  |
Number of consecutive terms (terms) | term | 2 |  |  |  |  |  |  |  |  |
Alternating term to nominate CEO (terms) | 2 years |  |  |  |  |  |  |  |  |
Number of members on the board (members) | member | 6 |  |  |  |  |  |  |  |  |
Number of vice presidents on the board (vice presidents) | vice_president | 5 |  |  |  |  |  |  |  |  |
Number of members nominated (members) | member | 3 |  |  |  |  |  |  |  |  |

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