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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Summarized income statement information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of unconsolidated structured entities [line items]      
Net sales $ 8,735,435 $ 10,192,818 $ 11,454,807
Cost of sales (7,099,923) (8,452,440) (8,483,328)
Gross profit 1,635,512 1,740,378 2,971,479
Selling, general and administrative expenses (762,882) (897,475) (876,764)
Other operating income (expenses), net 206,843 21,663 13,656
Profit (loss) from operating activities 1,079,473 864,566 2,108,371
Profit before income tax expense 1,159,359 826,564 2,031,567
Income tax expense (291,488) (196,519) (369,435)
Net profit (loss) before non-controlling interest 867,871 630,045 1,662,132
Non-controlling interest in other subsidiaries (89,403) (65,776) (155,485)
Net profit (loss) for the year 778,468 564,269 $ 1,506,647
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A.      
Disclosure of unconsolidated structured entities [line items]      
Net sales 3,133,000 3,790,000  
Cost of sales (2,509,000) (3,312,000)  
Gross profit 624,000 478,000  
Selling, general and administrative expenses (161,000) (181,000)  
Other operating income (expenses), net 61,000 (100,000)  
Profit (loss) from operating activities 524,000 197,000  
Financial expenses, net (234,000) (132,000)  
Equity in earnings of associated companies 30,000 46,000  
Profit before income tax expense 320,000 111,000  
Income tax expense (97,000) (16,000)  
Net profit (loss) before non-controlling interest 223,000 95,000  
Non-controlling interest in other subsidiaries (117,000) (41,000)  
Net profit (loss) for the year $ 106,000 $ 54,000