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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 Assets (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Cash and cash equivalents [Member]    
Disclosure Of Financial Assets At Date Of Initial Application Of IFRS 9 [Line Items]    
Original classification under IAS 39 Financial assets  
New classification under IFRS 9 Amortised cost  
Original carrying amount under IAS 39   $ 7,730,143
New carrying amount IFRS 9   7,730,143
Trade accounts receivable [Member]    
Disclosure Of Financial Assets At Date Of Initial Application Of IFRS 9 [Line Items]    
Original classification under IAS 39 Financial assets  
New classification under IFRS 9 Amortised cost  
Original carrying amount under IAS 39   997,370
New carrying amount IFRS 9   997,370
Derivative financial instruments [Member]    
Disclosure Of Financial Assets At Date Of Initial Application Of IFRS 9 [Line Items]    
Original classification under IAS 39 Fair value – hedging instrument  
New classification under IFRS 9 Fair value – hedging instrument  
Original carrying amount under IAS 39   106,815
New carrying amount IFRS 9   $ 106,815