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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)