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Related Parties - Summary of Transactions with Related Parties (Parenthetical) (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Grupo Carso, SAB de CV [member]      
Disclosure of transactions between related parties [line items]      
Materials purchased from subsidiaries $ 5,622,791 $ 9,829,991 $ 9,547,530
Network maintenance service cost 778,191 789,253 812,247
Associates [member]      
Disclosure of transactions between related parties [line items]      
Software service expense 13,784 15,695 705,074
Seguros Inbursa SA and Fianzas Guardiana Inbursa, SA [member]      
Disclosure of transactions between related parties [line items]      
Insurance premium $ 2,541,703 $ 3,330,038 $ 2,406,058