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Fair Values Of Financial Instruments - Reconciliation of unobservable input reconciliation (Detail) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of fair value measurement of assets [line items] |  |
Asset at beginning of period | $ 618,310,699 |
Asset at the end of period | 693,024,525 | $ 618,310,699
Level 3 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Asset at beginning of period | 5,061,719 |
Asset at the end of period | 7,215,808 | 5,061,719
Investment in equity instruments [member] | Level 3 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Increase (decrease) in fair value measurement, assets | 3,368,893 | 4,129,157
Derivatives [member] | Level 3 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Increase (decrease) in fair value measurement, assets | 497,000 | $ 932,562
Net monetary inflation adjustment [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Increase (decrease) in fair value measurement, assets | (1,259,527) |
Dividends received [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Increase (decrease) in fair value measurement, assets | $ (452,277) |

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