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Income Tax - Additional Information (Detail) - ARS ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Estimated a tax loss carryforward | $ 8,776 |  |
Deferred income tax assets, net | 588 | $ 564 | $ 954
Deferred income tax liabilities, net | $ 37,645 | 42,465 | 44,812
Indeterminate Maturity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax losses for which have not been recorded deferred tax asset |  | 48 |
Subsidiaries [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax losses for which have not been recorded deferred tax asset |  | 1,138 | 4,373
Subsidiaries [member] | 2017 onwards [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax losses for which have not been recorded deferred tax asset |  | $ 1,090 |
Subsidiaries [member] | Tax Losses Carryforward and Other Tax Credits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax losses for which have not been recorded deferred tax asset |  |  | 2,332
Subsidiaries [member] | Non Recoverable Taxable Temporary Differences [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax losses for which have not been recorded deferred tax asset |  |  | $ 2,041
Argentina [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Tax loss carryforwards expire | Expire within 5 years. |  |
Unused tax losses for which have not been recorded deferred tax asset | $ 6,484 |  |

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