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Mutual Funds Depositary Function - Summary of Shares Held in Mutual Funds Subscribed by Third Parties and Assets from Mutual Funds (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of mutual funds depositary function [line items]    
Equity $ 5,218,299 $ 3,562,427
Pionero Pesos [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 710,991,706  
Equity $ 6,230,480  
Pionero Renta Ahorro [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 97,409,727  
Equity $ 1,882,603  
Pionero FF [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 38,872,932  
Equity $ 621,204  
Pionero Gestion [Member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 996,810,463  
Equity $ 1,081,486  
Pionero Renta [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 16,676,404  
Equity $ 838,913  
Pionero Acciones [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 9,756,071  
Equity $ 327,566  
Pionero Empresas FCI Abierto PYMES [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 261,731,584  
Equity $ 1,475,402  
Pionero Pesos Plus [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 5,815,110,750  
Equity $ 30,594,852  
Pionero Renta Ahorro Plus [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 961,427,834  
Equity $ 4,326,701  
Pionero Renta Mixta I [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 20,336,414  
Equity $ 92,278  
Pionero Renta Estrategico [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 751,241,010  
Equity $ 2,065,990  
Pionero argentina bicentenario [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 343,298,122  
Equity $ 836,673  
Pionero Ahorro Dolares [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 3,624,907  
Equity $ 286,176  
Pionero renta fija dolares [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 3,108,507  
Equity $ 191,867  
Argenfunds Renta Pesos [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 199,849,796  
Equity $ 1,334,857  
Argenfunds Renta Argentina [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 8,911,464  
Equity $ 33,916  
Argenfunds Ahorro Pesos [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 65,544,394  
Equity $ 605,472  
Argenfunds Abierto Pymes [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 2,273,411,547  
Equity $ 4,638,247  
Argenfunds Renta Total [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 833,924,833  
Equity $ 860,190  
Argenfunds Renta Flexible [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 440,119,193  
Equity $ 1,418,107  
Argenfunds Renta Dinamica [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 8,522  
Equity $ 25  
Argenfunds Renta Fija [Member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 198,066,516  
Equity $ 3,045,372  
Argenfunds Renta Mixta [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 43,881  
Equity $ 28  
Argenfunds Renta Global [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 8,983,257  
Equity $ 33,192  
Argenfunds Renta Capital [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 23,013,791  
Equity $ 1,991,021  
Argenfunds Renta Balanceada [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 257,312,382  
Equity $ 1,046,268  
Argenfunds Liquidez [Member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 5,556,185,412  
Equity $ 8,941,739  
Argenfunds Retorno Absoluto [Member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 574,667,044  
Equity $ 1,088,368  
Argenfunds Renta Crecimiento [member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 23,949,324  
Equity $ 1,911,422  
Argenfunds Renta Mixta Plus [Member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 353,432  
Equity $ 23,928  
Argenfunds Renta Variable [Member]    
Disclosure of mutual funds depositary function [line items]    
Number of shares 276,458,840  
Equity $ 5,261