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BORROWINGS (Significant borrowings) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 3,221,907 | $ 1,218,635
Ternium Mexico Syndicated Loan Due November 2018 |  |
Disclosure of detailed information about borrowings [line items] |  |
Original principal amount | 800,000 |
Borrowings | 155,000 |
Tenigal Syndicated Loan Due July 2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Original principal amount | 200,000 |
Borrowings | 125,000 |
Ternium Investments S.à r.l Syndicated Loan Due September 2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Original principal amount | 1,500,000 |
Borrowings | $ 1,500,000 |

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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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