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BASIS OF PRESENTATION (Narrative) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 07, 2015 | Jan. 20, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Revenue |  |  |  | $ 9,700,296 | $ 7,223,975 | $ 7,877,449 |
Assets |  |  |  | 12,122,566 | 8,322,870 |  |
Liabilities |  |  |  | 6,269,795 | 3,156,277 |  |
Equity |  |  |  | 5,852,771 | 5,166,593 | $ 4,802,997 | $ 5,634,703
Decrease through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent | [1],[2],[3] | $ 29,600 |  |  |  |  |
Ternium Argentina S.A. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Revenue |  |  |  | 2,301,000 | 1,892,000 |  |
Profit (loss) from continuing operations attributable to non-controlling interests |  |  |  | 337,000 | 251,000 |  |
Assets |  |  |  | 2,820,000 | 2,415,000 |  |
Liabilities |  |  |  | 874,000 | 607,000 |  |
Equity |  |  |  | $ 1,945,000 | $ 1,807,000 |  |
Ferrasa S.A.S. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Proportion of ownership interest acquired |  |  | 46.00% |  |  |  |
Consideration paid (received) |  |  | $ 74,000 |  |  |  |
Ferrasa Panamá, S.A. |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Consideration paid (received) |  |  | $ 2,000 |  |  |  |
Proportion of ownership interest sold |  |  | 54.00% |  |  |  |
[1] | Corresponds to the acquisition on the non-controlling interest in Ternium Colombia S.A.S. (formerly Ferrasa S.A.S.). See note 2.b
[2] | Include mainly legal reserve under Luxembourg law for USD 200.5 million, undistributable reserves under Luxembourg law for USD 1.4 billion, hedge accounting reserve, net of tax effect, for USD (0.1) million and reserves related to the acquisition of non-controlling interest in subsidiaries for USD (88.5) million.
[3] | Shareholders’ equity is determined in accordance with accounting principles generally accepted in Luxembourg

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