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Property, Plant and Equipment, Net - Schedule of Relevant Information Related to Computation of Capitalized Borrowing Costs (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Capitalized interest $ 2,020,288 $ 2,875,034 $ 2,861,307
Capitalization rate 4.31% 4.30%  
Property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount invested in the acquisition of qualifying assets $ 45,456,630 $ 49,642,370 52,974,400
Capitalized interest $ 2,020,288 $ 2,875,034 $ 2,861,307
Capitalization rate 4.40% 5.80% 5.40%