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Employee Benefit Plans and Similar Obligations - Additional Information (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Amount charged to expense in relation with share-based plans $ 308 $ 162 $ 153
Repurchase of own shares issued, shares 250,795 263,298 171,330
Repurchase of own shares issued, value $ 120 $ 100 $ 50
Number of shares delivered under plan 538,252 502,996 520,031
Plan 2017-2020 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2017    
Plan 2014-17 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2014    
Plan 2015-18 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2015    
Plan 2016-19 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2016    
Plan 2018-2021 [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Share-based benefit plan validity period 3 years    
Share-based benefit plan grant date July 1, 2018    
Retirement Plan [member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Total charges $ 87 $ 80 $ 80
Performance Bonus Programs and Performance Evaluation [Member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Total charges $ 2,141 $ 1,650 $ 1,272