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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Summarized income statement information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of unconsolidated structured entities [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
Financial expenses, net (131,172) (114,583) (89,971)
Profit before income tax expense 2,031,567 1,359,809 1,118,457
Income tax expense (369,435) (336,882) (411,528)
Net profit (loss) before non-controlling interest 1,662,132 1,022,927 706,929
Non-controlling interest in other subsidiaries (155,485) (136,708) (111,285)
Net profit (loss) for the year 1,506,647 886,219 $ 595,644
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A.      
Disclosure of unconsolidated structured entities [line items]      
Net sales 3,766,000 3,368,000  
Cost of sales (3,154,000) (2,854,000)  
Gross profit 612,000 514,000  
Selling, general and administrative expenses (213,000) (206,000)  
Other operating income (expenses), net (153,000) (78,000)  
Profit (loss) from operating activities 246,000 230,000  
Financial expenses, net 15,000 (145,000)  
Equity in earnings of associated companies 70,000 49,000  
Profit before income tax expense 331,000 134,000  
Income tax expense (110,000) (34,000)  
Net profit (loss) before non-controlling interest 221,000 100,000  
Non-controlling interest in other subsidiaries (28,000) (26,000)  
Net profit (loss) for the year $ 193,000 $ 74,000