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Commitments and Contingencies - Schedule of Purchase Commitments with Two Carriers (Detail) - Wireless carriers [member] - Purchase commitment for purchase of airtime minutes at current market prices [member]
$ in Thousands
Dec. 31, 2017
MXN ($)
Disclosure of commitments [line items]  
Purchase commitments $ 141,850,852
2018 [member]  
Disclosure of commitments [line items]  
Purchase commitments 72,201,668
2019 [member]  
Disclosure of commitments [line items]  
Purchase commitments 53,621,957
2020 [member]  
Disclosure of commitments [line items]  
Purchase commitments $ 16,027,227