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Note 33 - Subsequent Event (Details Textual) |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |
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Feb. 21, 2018 USD ($) $ / shares | Feb. 08, 2018 USD ($) | Nov. 22, 2017 USD ($) $ / shares | May 24, 2017 USD ($) $ / shares | Nov. 23, 2016 $ / shares | May 25, 2016 $ / shares | Nov. 25, 2015 $ / shares | May 20, 2015 $ / shares | Nov. 27, 2014 $ / shares | May 25, 2016 USD ($) | May 20, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 01, 2017 $ / shares | May 03, 2017 $ / shares | May 04, 2016 $ / shares | May 06, 2015 $ / shares
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per share including interim dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.41 | $ 0.45 | $ 0.45
Dividends payable, amount per ads including interim dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.82 | $ 0.90 | $ 0.90
Dividends paid, ordinary shares per share |  |  | $ 0.13 | $ 0.28 | $ 0.13 | $ 0.30 | $ 0.15 | $ 0.30 | $ 0.15 |  |  |  |  |  |  |  |  |
Dividends paid, per ads |  |  | $ 0.26 | $ 0.56 | $ 0.26 | $ 0.60 | $ 0.30 | $ 0.60 | $ 0.30 |  |  |  |  |  |  |  |  |
Dividends recognised as distributions to owners | $ |  |  | $ 153,000,000 | $ 484,000,000 |  |  |  |  |  | $ 531,200,000 | $ 531,200,000 | $ 508,020,000 | $ 536,720,000 | $ 534,192,000 |  |  |  |
Dividends payable, amount per ads |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.26 |  |  |
Announcing or commencing implementation of major restructuring [member] | Usiminas [member] | Ternium Investments S.à r.l. and Nippon Steel & Sumitomo Metal Corporation [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Governance covenant, term of intervals for the nomination of CEO and Chairman |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Governance covenant, number of consecutive years in an interval for the nomination of CEO and Chairman |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Governance covenant, term of consecutive years in an interval for the nomination of CEO and Chairman |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Governance covenant, total number of members in the executive board |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Governance covenant, total number of Vice-Presidents in the executive board | $ |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring covenant, number of allowed nominations per associate |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Governance covenant, minimum term of holding for current shareholders to exercise in a buy-and-sell procedure |  | 4 years 182 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends proposed after the reporting period [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per share including interim dividend | $ 0.41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per ads including interim dividend | $ 0.82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable including interim dividends | $ | $ 484,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share | $ 0.28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, amount per ads | $ 0.56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payables | $ | $ 331,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_107&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2017-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2017-03-01&anchor=para_16A_f&doctype=Standard -URIDate 2017-03-09 + Details
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