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INVESTMENTS IN NON-CONSOLIDATED COMPANIES INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) MWh | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Revenue | $ 9,700,296 | $ 7,223,975 | $ 7,877,449 |
Equity | $ 5,852,771 | 5,166,593 | $ 4,802,997 | $ 5,634,703
Techgen S.A. de C.V. |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Number of megawatts | MWh | 900 |  |  |
Subordinated liabilities | $ 92,500 | 23,900 |  |
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% |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Revenue | $ 3,368,000 | 2,443,000 |  |
Revenue | 100,000 |  |  |
Equity | $ 4,164,086 | $ 4,153,000 |  |

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