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Fair Values Of Financial Instruments - Reconciliation of unobservable input reconciliation (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
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)