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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Tender offer litigation) (Details) - Pending Litigation - Comphania Siderúrgica Nacional vs. Ternium Investments S.a.r.l., Siderar & Confab Industrial S.A. | 12 Months Ended
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Dec. 31, 2013 R$ / shares shares
Disclosure of contingent liabilities [line items] |
Tender offer, percent | 80.00%
Tender offer, price per share | R$ / shares | R$ 28.8
Tender offer, number of shares | shares | 182,609,851
Ternium Investments S.a.r.l. |
Disclosure of contingent liabilities [line items] |
Proportion of shares in tender offer | 60.60%
Ternium Argentina S.A. |
Disclosure of contingent liabilities [line items] |
Proportion of shares in tender offer | 21.50%

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