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SEGMENT INFORMATION (Segment reporting information, by segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Net sales $ 9,700,296 $ 7,223,975 $ 7,877,449
Cost of sales (7,403,025) (5,384,390) (6,477,272)
Gross profit 2,297,271 1,839,585 1,400,177
Selling, general and administrative expenses (824,247) (687,942) (770,292)
Other operating (expenses) income, net (16,240) (9,925) 9,454
Profit (loss) from operating activities 1,456,784 1,141,718 639,339
Other financial income (expenses), net (69,915) 37,957 (17,922)
Equity in (losses) earnings of non-consolidated companies 68,115 14,624 (272,810)
Profit before income tax expense 1,359,809 1,118,457 267,099
Inter- segment eliminations      
Disclosure of operating segments [line items]      
Net sales (271,441) (202,670) (200,817)
Cost of sales 275,586 198,686 193,963
Gross profit 4,145 (3,984) (6,854)
Selling, general and administrative expenses 0 0 0
Other operating (expenses) income, net 0 0 0
Profit (loss) from operating activities 4,145 (3,984) (6,854)
Steel | Operating segments      
Disclosure of operating segments [line items]      
Net sales 9,700,260 7,221,751 7,875,161
Cost of sales (7,465,751) (5,391,038) (6,456,584)
Gross profit 2,234,509 1,830,713 1,418,577
Selling, general and administrative expenses (811,487) (677,007) (757,078)
Other operating (expenses) income, net (17,011) (9,543) 9,151
Profit (loss) from operating activities 1,406,011 1,144,163 670,650
Mining | Operating segments      
Disclosure of operating segments [line items]      
Net sales 271,477 204,894 203,105
Cost of sales (212,860) (192,038) (214,651)
Gross profit 58,617 12,856 (11,546)
Selling, general and administrative expenses (12,760) (10,935) (13,214)
Other operating (expenses) income, net 771 (382) 303
Profit (loss) from operating activities 46,628 1,539 (24,457)
Ternium      
Disclosure of operating segments [line items]      
Net sales 9,700,296 7,223,975 7,877,449
Profit (loss) from operating activities 1,131,008 940,303 1,008,152
Other financial income (expenses), net (165,090) (37,885) (99,430)
Equity in (losses) earnings of non-consolidated companies 68,115 14,624 (272,810)
Profit before income tax expense 1,359,809 1,118,457 267,099
Depreciation and amortisation expense (474,299) (406,890) (433,788)
Ternium | Inter- segment eliminations      
Disclosure of operating segments [line items]      
Net sales (287,116) (206,006) (213,807)
Profit (loss) from operating activities (1,291) 269 (640)
Depreciation and amortisation expense 0 0 0
Ternium | Reconciling items      
Disclosure of operating segments [line items]      
Cost of sales (325,776) (201,415) 368,813
Ternium | Steel | Operating segments      
Disclosure of operating segments [line items]      
Net sales 9,700,260 7,221,751 7,875,161
Profit (loss) from operating activities 1,065,605 936,164 1,012,282
Depreciation and amortisation expense (424,529) (361,685) (384,380)
Ternium | Mining | Operating segments      
Disclosure of operating segments [line items]      
Net sales 287,152 208,230 216,095
Profit (loss) from operating activities 66,694 3,871 (3,490)
Depreciation and amortisation expense $ (49,770) $ (45,205) $ (49,408)