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REGULATORY FRAMEWORK, General Framework of the Natural Gas Transportation Segment (Details) $ in Thousands, $ in Millions | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 ARS ($) | Dec. 31, 2016 ARS ($) | Dec. 31, 2015 ARS ($) | Dec. 31, 2005 Proposal | Apr. 01, 2018 | Dec. 01, 2017 | Apr. 02, 2017 | Mar. 30, 2017 | Feb. 24, 2016 ARS ($) | Jun. 05, 2015 | Aug. 01, 2014 | Jun. 01, 2014 | Apr. 07, 2014 | Apr. 01, 2014 | Oct. 09, 2008 | May 22, 2007 USD ($)
General aspects [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original license period | 35 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License period, renewal | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License period, after renewal | 45 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tariff situation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas transportation tariffs period, condition one | semi-annually |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas transportation tariffs period, condition two | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate of exchange for tariffs | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transitional Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of proposals | Proposal |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in tariff |  |  |  |  |  |  |  |  |  |  | 20.00% | 14.00% |  | 8.00% | 20.00% |
Authorized percentage of increase in tariff |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Percentage of increase in tariff on service for natural gas transportation |  |  |  |  |  | 80.80% | 64.20% | 214.20% |  | 44.30% |  |  |  |  |  |
Percentage of increase in tariff on access and use |  |  |  |  |  | 29.70% | 0.00% | 37.00% |  | 73.20% |  |  |  |  |  |
Percentage of tariff increase on public service of Natural Gas Transportation and CAU |  |  |  |  |  |  |  |  | 200.10% |  |  |  |  |  |  |
2016 Investment Plan nominal value |  |  |  |  |  |  |  |  | $ 794,300 |  |  |  |  |  |  |
Extended period of RTI process | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment plan period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Year Plan investment amount | $ 6,786,543 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of amount of investment plan | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of the Rights of Arbitration Proceedings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award to claimants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 106.2
Acquisition of rights of arbitration proceeding | $ 0 | $ 0 | $ (324,390) |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transitional Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of tariff increase on public service of Natural Gas Transportation and CAU |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |

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