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Accounts Receivable from Subscribers, Distributors, Recoverable Taxes and Other, Net - Summary of Aging of Accounts Receivable (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of accounts receivable [line items]    
Trade and other receivables $ 203,562,725 $ 216,959,399
Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 242,607,650 254,311,076
Receivable from subscribers and distributors [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 178,722,706 186,744,954
Receivable from subscribers and distributors [member] | 1 - 30 days [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 46,758,825 19,175,008
Receivable from subscribers and distributors [member] | 31 - 60 days [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 6,780,671 5,835,162
Receivable from subscribers and distributors [member] | 61 - 90 days [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 4,375,188 4,209,456
Receivable from subscribers and distributors [member] | Greater than 90 days [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables 42,423,848 44,510,622
Unbilled services provided [member] | Receivable from subscribers and distributors [member] | Cost [member]    
Disclosure of accounts receivable [line items]    
Trade and other receivables $ 78,384,174 $ 113,014,706