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FINANCIAL RISK MANAGEMENT, Foreign Exchange Risk (Details) - Foreign Exchange Risk [Member] $ in Thousands | 12 Months Ended |  |  |
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Dec. 31, 2017 ARS ($) | Dec. 31, 2016 ARS ($) | Dec. 31, 2015 ARS ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Net liability position [Abstract] |  |  |  |  |  |
Net liability position |  |  |  | $ (93,366) | $ (192,574) | $ (186,754)
Decrease of financial results [Abstract] |  |  |  |  |  |
Decrease of financial results | $ 176,045,000 | $ 306,961,000 | $ 244,418,000 |  |  |
Derivative financial instruments [Abstract] |  |  |  |  |  |
Net position of buying financial instruments |  |  |  |  |  | $ 52,500
Weighted average exchange rate |  |  | 11.65 |  |  |
U.S. Dollars [Member] |  |  |  |  |  |
Foreign exchange risk [Abstract] |  |  |  |  |  |
Percentage of funds denominated in US dollars to mitigate foreign exchange risk |  |  |  | 57.00% |  |
Percentage appreciation (depreciation) of US Dollar against Argentine Peso | 10.00% |  |  |  |  |
U.S. Dollars [Member] | Liquids Production and Commercialization [Member] |  |  |  |  |  |
Foreign exchange risk [Abstract] |  |  |  |  |  |
Percentage of revenue | 76.00% | 79.00% | 84.00% |  |  |
Argentine Pesos [Member] | Liquids Production and Commercialization [Member] |  |  |  |  |  |
Foreign exchange risk [Abstract] |  |  |  |  |  |
Percentage of revenue | 51.00% | 43.00% | 40.00% |  |  |

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of assets less the amount of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 1 -IssueDate 2017-01-01 -Paragraph IG63 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=1&date=2017-03-01&anchor=para_IG63&doctype=Implementation%20Guidance -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The percentage of the entity's revenue. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_34&doctype=Standard -URIDate 2017-03-09 + Details
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