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Income Tax - Summary of Reconciliation between the Charge to Income for Income Tax and the One that would Result from Applying the Prevailing Tax Rate on Net Income Before Income Tax Arising from the Consolidated Statements of Comprehensive Income (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Net income before income tax $ 8,703 $ (29,804) $ 29,063
Statutory tax rate 35.00% 35.00% 35.00%
Statutory tax rate applied to net income before income tax $ (3,046) $ 10,431 $ (10,172)
Effect of the valuation of property, plant and equipment and intangible assets measured in functional currency (18,185) (19,543) (31,200)
Exchange differences 12,318 12,237 19,164
Effect of the valuation of inventories (1,558) (1,819) (2,412)
Income on investments in associates and joint ventures 500 206 111
Effect by change of tax rate 13,892    
Miscellaneous 48 (87) (128)
Income tax $ 3,969 $ 1,425 $ (24,637)