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Basis of Presentation - Explanation of Original Measurement Categories under IAS 39 and New Measurement Categories under IFRS 9 for Each Class of Financial Liabilities (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Long-term debt securities [Member]    
Disclosure Of Financial Liabilities At Date Of Initial Application Of IFRS 9 [Line Items]    
Original classification under IAS 39 Financial liabilities  
New classification under IFRS 9 Financial liabilities  
Original carrying amount under IAS 39   $ 9,000,000
New carrying amount IFRS 9   9,000,000
Current and long term bank loans [Member]    
Disclosure Of Financial Liabilities At Date Of Initial Application Of IFRS 9 [Line Items]    
Original classification under IAS 39 Financial liabilities  
New classification under IFRS 9 Financial liabilities  
Original carrying amount under IAS 39   4,252,258
New carrying amount IFRS 9   4,252,258
Accounts payable [Member]    
Disclosure Of Financial Liabilities At Date Of Initial Application Of IFRS 9 [Line Items]    
Original classification under IAS 39 Financial liabilities  
New classification under IFRS 9 Financial liabilities  
Original carrying amount under IAS 39   1,037,155
New carrying amount IFRS 9   $ 1,037,155