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Note 13 - Investments in Non-consolidated Companies - Summary of Selected Financial Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of unconsolidated structured entities [line items]        
Non-current assets $ 9,428,517 $ 9,172,384    
Current assets 4,287,672 5,670,607    
Total assets 13,716,189 14,842,991 $ 14,251,299  
Non-current liabilities 1,103,241 876,162    
Current liabilities 1,166,475 1,780,457    
Total liabilities 2,269,716 2,656,619    
Equity 11,446,473 12,186,372 11,875,492 $ 11,588,988
Non-controlling interests 183,585 197,414    
Revenues 5,146,734 7,294,055 7,658,588  
Gross profit 1,059,417 2,186,560 2,379,288  
Net income for the year attributable to owners of the parent (634,418) 742,686 876,063  
Total comprehensive income for the year, net of tax, attributable to owners of the parent (643,435) 690,095 $ 776,713  
Ternium S.A. [member]        
Disclosure of unconsolidated structured entities [line items]        
Non-current assets 8,289,460 8,757,320    
Current assets 4,566,775 4,178,213    
Total assets 12,856,235 12,935,533    
Non-current liabilities 2,559,485 3,452,535    
Current liabilities 1,853,597 1,768,125    
Total liabilities 4,413,082 5,220,660    
Equity 8,443,153 7,714,873    
Revenues 8,735,435 10,192,818    
Gross profit 1,635,512 1,740,378    
Net income for the year attributable to owners of the parent 778,468 564,269    
Total comprehensive income for the year, net of tax, attributable to owners of the parent 666,667 445,473    
Usiminas [member]        
Disclosure of unconsolidated structured entities [line items]        
Non-current assets 3,487,317 4,335,662    
Current assets 2,276,368 2,198,449    
Total assets 5,763,685 6,534,111    
Non-current liabilities 1,661,605 1,955,395    
Current liabilities 861,912 716,930    
Total liabilities 2,523,517 2,672,325    
Equity 3,240,168 3,861,786    
Revenues 3,132,949 3,790,206    
Gross profit 624,199 478,141    
Net income for the year attributable to owners of the parent $ 106,361 $ 52,779