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Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 Rate MMBbls Bcf MMBoe | Dec. 31, 2016 MMBbls Bcf MMBoe | Dec. 31, 2015 MMBbls Bcf MMBoe
Disclosure of discounted future net cash flow [Line Items] |  |  |
Extension and discoveries of proved development reserves | 26 | 42 | 54
Extension and discoveries of proved undevelopment reserves | 54 | 79 | 93
Net proved reserves of oil equivalent, Improved recovery | 32 | 35 | 23
Proved developed reserves of sales and acquisition | 2.3 | 19.5 |
Revised proved reserves | 96 | 89 | 71
Proved developed reserves reduced due to lower average oil price | 105 | 105 |
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases | 20 | 45 |
Proved developed reserves revisions of previous estimates increases by liquids and gas production performance | 25 | 68 | 56
Proved developed reserves revisions of previous estimates increases by well performance | 48 | 80 |
Proved reserves revisions of previous estimates of feasibility studies increases | 5.6 | 12 |
Proved reserves revisions of previous estimates of Production and forecast Decreases | 7 | 10 | 10
Net proved reserves of sales and acquisition |  | 30.7 |
Proved undeveloped reserves of sales and acquisition |  | 11.2 |
Net proved reserves declined after sales and acquisition |  |  | 16.3
Proved developed reserves declined after sales and acquisition |  |  | (8.2)
Proved undeveloped reserves declined after sales and acquisition |  |  | (8.1)
Percentage of discount rate | 10.00% |  |
Selling exchange rate | Rate | 18.599 |  |
Golfo San Jorge basin [Member] |  |  |
Disclosure of discounted future net cash flow [Line Items] |  |  |
Proved developed reserves of oil equivalent, Improved reserves | 5.6 | 8 | 8
Proved undeveloped reserves of oil equivalent, Improved reserves | 9.6 | 17 | 5
Proved developed reserves reduced due to lower average oil price | (25) | (40) |
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases | (3) | (16) |
Proved developed reserves revisions of previous estimates increases by well performance | 14 | 42 |
Proved reserves revisions of previous estimates of feasibility studies increases | 3.5 | 2 |
Revision due to reservoirs current performance |  |  | 17
Proved reserves removed due to impact of lower average oil prices |  |  | 21
Neuquina basin [Member] |  |  |
Disclosure of discounted future net cash flow [Line Items] |  |  |
Proved developed reserves of oil equivalent, Improved reserves | 5.4 | 7 | 5
Proved undeveloped reserves of oil equivalent, Improved reserves | 10 | 2 | 3
Proved developed reserves reduced due to lower average oil price | (60) | (43) |
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases | (15) | (15) |
Proved developed reserves revisions of previous estimates increases by well performance | 31 | 27 |
Proved developed reserves revisions of previous estimates decreases by well performance | 23 | 12 |
Proved reserves revisions of previous estimates of feasibility studies increases | 2.1 | 10 |
Revision due to reservoirs current performance |  |  | 21
Golfo San Jorge And Neuquina Basins [Member] |  |  |
Disclosure of discounted future net cash flow [Line Items] |  |  |
Proved reserves revisions of previous estimates of WO jobs performance increases | 4.2 |  |
Crude oil [Member] |  |  |
Disclosure of discounted future net cash flow [Line Items] |  |  |
Extension and discoveries of proved development reserves | MMBbls | 7.4 | 15.5 | 20
Extension and discoveries of proved undevelopment reserves | MMBbls | 11.7 | 29 | 24
Revised proved reserves | MMBbls | 71 | 75 | 31
Proved developed reserves revisions of previous estimates increases by liquids and gas production performance | MMBbls |  |  | 29.3
Revision due to reservoirs current performance | MMBbls |  |  | 8.8
Proved reserves removed due to impact of lower average oil prices | MMBbls |  |  | 9.4
Natural Gas Liquids [Member] |  |  |
Disclosure of discounted future net cash flow [Line Items] |  |  |
Extension and discoveries of proved development reserves | MMBbls | 1.9 | 3.8 | 2
Extension and discoveries of proved undevelopment reserves | MMBbls | 3.4 | 7 | 8
Revised proved reserves | MMBbls | 4 | 5 | 9
Proved developed reserves revisions of previous estimates increases by liquids and gas production performance | MMBbls |  |  | 5.7
Revision due to reservoirs current performance | Bcf |  |  | 47.4
Natural gas [Member] |  |  |
Disclosure of discounted future net cash flow [Line Items] |  |  |
Extension and discoveries of proved development reserves | Bcf | 94 | 128.8 | 178
Extension and discoveries of proved undevelopment reserves | Bcf | 219 | 242 | 342
Revised proved reserves | Bcf | 161 | 110 | 175
Proved developed reserves revisions of previous estimates increases by liquids and gas production performance | Bcf |  |  | 117
Proved reserves removed due to impact of lower average oil prices | Bcf |  |  | 64.6
Cuyana basin [Member] |  |  |
Disclosure of discounted future net cash flow [Line Items] |  |  |
Proved developed reserves reduced due to lower average oil price | (14) | (8) |
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases |  | (2) |
Austral basin [Member] |  |  |
Disclosure of discounted future net cash flow [Line Items] |  |  |
Proved developed reserves reduced due to lower average oil price |  | (14) |
Proved undeveloped reserves revisions of previous estimates of economic conditions decreases |  | (12) |

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