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Related Parties - Summary of Transactions with Related Parties (Parenthetical) (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Grupo Carso, SAB de CV [member]      
Disclosure of transactions between related parties [line items]      
Materials purchased from subsidiaries $ 9,829,991 $ 9,547,530 $ 5,823,537
Network maintenance service cost 789,253 812,247 721,416
Associates [member]      
Disclosure of transactions between related parties [line items]      
Software service expense 15,695 705,074 216,910
Seguros Inbursa SA and Fianzas Guardiana Inbursa, SA [member]      
Disclosure of transactions between related parties [line items]      
Insurance premium 3,330,038 2,406,058 2,635,342
Executives [member]      
Disclosure of transactions between related parties [line items]      
Short term direct benefit paid $ 1,229,442 $ 1,255,326 $ 915,135