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SEGMENT INFORMATION (Segment reporting information, by segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of operating segments [line items] |  |  |
Net sales | $ 11,454,807 | $ 9,700,296 | $ 7,223,975
Cost of sales | (8,483,328) | (7,403,025) | (5,384,390)
Gross profit | 2,971,479 | 2,297,271 | 1,839,585
Selling, general and administrative expenses | (876,764) | (824,247) | (687,942)
Other operating income (expenses), net | 13,656 | (16,240) | (9,925)
Profit (loss) from operating activities | 2,108,371 | 1,456,784 | 1,141,718
Other financial income (expenses), net | (69,640) | (69,915) | 37,957
Equity in earnings (losses) of non-consolidated companies | 102,772 | 68,115 | 14,624
Profit before income tax expense | 2,031,567 | 1,359,809 | 1,118,457
Inter- segment eliminations |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | (280,613) | (271,441) | (202,670)
Cost of sales | 281,455 | 275,586 | 198,686
Gross profit | 842 | 4,145 | (3,984)
Selling, general and administrative expenses | 0 | 0 | 0
Other operating income (expenses), net | 0 | 0 | 0
Profit (loss) from operating activities | 842 | 4,145 | (3,984)
Steel |  |  |
Disclosure of operating segments [line items] |  |  |
Effect of inflation adjustment on net sales | 270,000 |  |
Effect of inflation adjustment on cost of sales | 38,000 |  |
Effect of inflation adjustment on selling, general and administrative expense | 24,000 |  |
Effect of inflation adjustment on other operating expenses, net | 3,000 |  |
Steel | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 11,453,420 | 9,700,260 | 7,221,751
Cost of sales | (8,524,890) | (7,465,751) | (5,391,038)
Gross profit | 2,928,530 | 2,234,509 | 1,830,713
Selling, general and administrative expenses | (860,881) | (811,487) | (677,007)
Other operating income (expenses), net | 12,950 | (17,011) | (9,543)
Profit (loss) from operating activities | 2,080,599 | 1,406,011 | 1,144,163
Mining | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 282,000 | 271,477 | 204,894
Cost of sales | (239,893) | (212,860) | (192,038)
Gross profit | 42,107 | 58,617 | 12,856
Selling, general and administrative expenses | (15,883) | (12,760) | (10,935)
Other operating income (expenses), net | 706 | 771 | (382)
Profit (loss) from operating activities | 26,930 | 46,628 | 1,539
Ternium |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 11,725,270 | 9,700,296 | 7,223,975
Profit (loss) from operating activities | 1,853,319 | 1,131,008 | 940,303
Other financial income (expenses), net | (179,576) | (165,090) | (37,885)
Equity in earnings (losses) of non-consolidated companies | 102,772 | 68,115 | 14,624
Profit before income tax expense | 2,031,567 | 1,359,809 | 1,118,457
Depreciation and amortisation expense | (589,299) | (474,299) | (406,890)
Ternium | Inter- segment eliminations |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | (332,505) | (287,116) | (206,006)
Profit (loss) from operating activities | (6,213) | (1,291) | 269
Depreciation and amortisation expense | 0 | 0 | 0
Ternium | Reconciling items |  |  |
Disclosure of operating segments [line items] |  |  |
Cost of sales | (541,492) | (325,776) | (201,415)
Effect of inflation adjustment | (286,440) |  |
Ternium | Steel | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 11,723,883 | 9,700,260 | 7,221,751
Profit (loss) from operating activities | 1,768,115 | 1,065,605 | 936,164
Depreciation and amortisation expense | (537,885) | (424,529) | (361,685)
Ternium | Mining | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 333,892 | 287,152 | 208,230
Profit (loss) from operating activities | 91,418 | 66,694 | 3,871
Depreciation and amortisation expense | $ (51,415) | $ (49,770) | $ (45,205)

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