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BASIS OF PREPARATION OF CONSOLIDATED FINANCIAL STATEMENTS AND APPLICATION OF ACCOUNTING CRITERIA - Functional currency and presentation currency (Details)
 12 Months Ended
Dec. 31, 2020
$ / $
Dec. 31, 2019
$ / $
Dec. 31, 2020
$ /
Dec. 31, 2020
$ / R$
Dec. 31, 2020
$ / $
Dec. 31, 2019
$ /
Dec. 31, 2019
$ / R$
Dec. 31, 2019
$ / $
Dec. 31, 2018
$ / $
Dec. 31, 2018
$ /
Dec. 31, 2018
$ / R$
Dec. 31, 2018
$ / $
BASIS OF PREPARATION OF CONSOLIDATED FINANCIAL STATEMENTS AND APPLICATION OF ACCOUNTING CRITERIA                        
Minimum accumulated inflation rate for three year stands out 100.00%                      
Inflation rate (as a percent) 36.01% 54.85%                    
Exchange rates and value of the UF at the close 710.95 748.74 0.103 136.80 8.44 0.116 185.76 12.50 694.77 0.117 179.30 18.43