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Employee Benefit Plans and Share-Based Payments - Additional Information (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Amount charged to expense in relation with share-based plans $ 162 $ 153 $ 124
Repurchase of own shares issued, shares 263,298 171,330 382,985
Repurchase of own shares issued, value $ 100 $ 50 $ 120
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    
Number of shares delivered under plan 502,996 520,031 623,350
Retirement Plan [Member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Total charges $ 80 $ 80 $ 50
Performance Bonus Programs and Performance Evaluation [Member]      
Disclosure Of Employee Benefit Plans And Similar Obligations [Line Items]      
Total charges $ 1,650 $ 1,272 $ 1,020