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Note 12 - Investments in Non-consolidated Companies - Summary of Selected Financial Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Non-current assets $ 9,017,064 $ 9,034,704  
Current assets 5,381,154 4,817,154  
Total assets 14,398,218 14,003,275  
Non-current liabilities 746,349 859,073  
Current liabilities 2,070,899 1,713,036  
Total liabilities 2,817,248 2,590,203  
Non-controlling interests 98,785 125,655  
Revenues 5,288,504 4,293,592 $ 6,903,123
Gross profit 1,603,447 1,127,908 2,155,363
Net income for the year attributable to owners of the parent 544,737 55,298 (80,162)
Total comprehensive income for the year, net of tax, attributable to owners of the parent 683,531 81,702 $ (410,187)
Ternium s.a. [member]      
Statement Line Items [Line Items]      
Non-current assets 7,727,283 5,622,556  
Current assets 4,395,283 2,700,314  
Total assets 12,122,566 8,322,870  
Non-current liabilities 3,442,521 1,324,785  
Current liabilities 2,827,275 1,831,492  
Total liabilities 6,269,796 3,156,277  
Non-controlling interests 842,347 775,295  
Revenues 9,700,296 7,223,975  
Gross profit 2,297,271 1,839,585  
Net income for the year attributable to owners of the parent 886,219 595,644  
Total comprehensive income for the year, net of tax, attributable to owners of the parent 815,434 534,827  
Usiminas [member]      
Statement Line Items [Line Items]      
Non-current assets 5,661,947 6,085,811  
Current assets 2,193,096 1,970,015  
Total assets 7,855,043 8,055,826  
Non-current liabilities 2,344,042 2,856,883  
Current liabilities 920,924 537,646  
Total liabilities 3,264,966 3,394,529  
Non-controlling interests 425,988 508,083  
Revenues 3,367,937 2,442,596  
Gross profit 513,712 150,999  
Net income for the year attributable to owners of the parent $ 99,853 $ (166,153)