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INVESTMENT IN ASSOCIATES (Details) - ARS ($) $ in Thousands | Oct. 13, 2016 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Investment in associates [Abstract] |  |  |
Cost value |  | $ 624 |
Book value |  | 3,065 | $ 2,874
Emprendimientos de Gas del Sur S.A. (in liquidation) ("EGS") |  |  |
Investment in associates [Abstract] |  |  |
Cost value |  | 116 |
Book value |  | 367 | 357
Distribution of dividend in kind | $ 4,673 |  |
Transporte y Servicios de Gas en Uruguay S.A. ("TGU") |  |  |
Investment in associates [Abstract] |  |  |
Cost value |  | 5 |
Book value |  | 2,698 | 2,517
EGS and TGU [Member] |  |  |
Investment in associates [Abstract] |  |  |
Cost value |  | 121 |
Book value |  | 3,065 | 2,874
Gas Link S.A. ("Link") |  |  |
Investment in associates [Abstract] |  |  |
Cost value |  | 503 |
Book value |  | $ 0 | $ 0

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