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Net Gain From Measurement Of Financial Instruments At Fair Value - Summary of Net gain from Measurement of Financial Instruments (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial instruments at fair value through profit or loss [line items]      
Gains losses on financial assets at fair value through profit or loss $ 13,978,694 $ 10,799,758 $ 2,641,829
Gain from government securities [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Gains losses on financial assets at fair value through profit or loss 10,076,885 2,570,385 1,145,974
Gain from private securities [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Gains losses on financial assets at fair value through profit or loss 847,819 1,133,530 682,391
Gain from derivative financial instruments Forward transactions [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Gains losses on financial assets at fair value through profit or loss 75,950 2,051,535 522,385
Gain from derivative financial instruments Put options [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Gains losses on financial assets at fair value through profit or loss 417,029 769,490  
Gain from other financial assets [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Gains losses on financial assets at fair value through profit or loss 2,658 246,356 524,281
Gain from equity instruments at fair value through profit or loss [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Gains losses on financial assets at fair value through profit or loss 2,523,585 4,530,493 27,976
Gain / (Loss) from sales or derecognition of financial assets at fair value [Member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Gains losses on financial assets at fair value through profit or loss $ 34,768 $ (502,031) $ (261,178)