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INVESTMENTS IN ASSOCIATES (Details) - ARS ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
 [1]
Dec. 31, 2016
 [1]
Investments in associates [Abstract]        
Book value $ 78,660 $ 111,790    
Common stock 28,349,861 28,224,365    
Shareholders' equity $ 48,083,469 47,603,906 $ 38,888,199 $ 30,041,011
Transporte y Servicios de Gas en Uruguay S.A.        
Investments in associates [Abstract]        
Face value (in pesos per share) $ 1      
Amount $ 196,000      
Cost 182      
Book value $ 6,627 8,919    
Main business Pipeline maintenance      
Date 9/30/2019      
Common stock $ 28      
Net (loss) / income for the year / period (783)      
Shareholders' equity $ 14,308      
% of Common Stock 49.00%      
Emprendimientos de Gas del Sur S.A. [Member]        
Investments in associates [Abstract]        
Face value (in pesos per share) $ 1      
Amount $ 116,130      
Cost 2,025      
Book value $ 418 498    
Main business Pipeline construction and operation services      
Date 9/30/2019      
Common stock $ 237      
Net (loss) / income for the year / period (186)      
Shareholders' equity $ 854      
% of Common Stock 49.00%      
Gas Link S.A.        
Investments in associates [Abstract]        
Face value (in pesos per share) $ 1      
Amount $ 502,962      
Cost 8,595      
Book value $ 71,615 $ 102,373    
Main business Pipeline construction and operation services      
Date 9/30/2019      
Common stock $ 1,026      
Net (loss) / income for the year / period 6,990      
Shareholders' equity $ 396,461      
% of Common Stock 49.00%      
[1] The Company has applied IFRS 15 and IFRS 9 for the first time on January 1, 2018. In accordance with the transition methods chosen, the comparative information has not been modified. See Note 4.a)