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Related Parties - Summary of Transactions with Related Parties (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [abstract]      
Construction services, purchases of materials, inventories and property, plant and equipment $ 11,030,944 $ 9,917,280 $ 5,975,677
Insurance premiums, fees paid for administrative and operating services, brokerage services and others 4,135,578 4,118,469 4,332,331
Rent of towers 5,326,366 4,748,503 927,678
Other services 2,802,667 1,899,818 1,379,269
Investments and expenses: 23,295,555 20,684,070 12,614,955
Telecommunications services 416,047 411,076 271,196
Sale of materials and other services 2,313,840 2,679,591 2,398,994
Revenues $ 2,729,887 $ 3,090,667 $ 2,670,190