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INVESTMENTS IN NON-CONSOLIDATED COMPANIES INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Summarized income statement information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of unconsolidated structured entities [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
Finance expense (114,583) (89,971) (89,489)
Profit before income tax expense 1,359,809 1,118,457 267,099
Income tax expense (336,882) (411,528) (207,320)
Net profit (loss) before non-controlling interest 1,022,927 706,929 59,779
Non-controlling interest in other subsidiaries (136,708) (111,285) (51,652)
Net profit (loss) for the year 886,219 595,644 $ 8,127
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A.      
Disclosure of unconsolidated structured entities [line items]      
Net sales 3,368,000 2,443,000  
Cost of sales (2,854,000) (2,292,000)  
Gross profit 514,000 151,000  
Selling, general and administrative expenses (206,000) (180,000)  
Other operating (expenses) income, net (78,000) (61,000)  
Profit (loss) from operating activities 230,000 (90,000)  
Finance expense (145,000) (17,000)  
Equity in earnings of associated companies 49,000 40,000  
Profit before income tax expense 134,000 (67,000)  
Income tax expense (34,000) (99,000)  
Net profit (loss) before non-controlling interest 100,000 (166,000)  
Non-controlling interest in other subsidiaries (26,000) (28,000)  
Net profit (loss) for the year $ 74,000 $ (194,000)