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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]      
Capitalized interest $ 2,875,034 $ 2,861,307 $ 3,524,841
Capitalization rate 4.30% 4.20%  
Property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount invested in the acquisition of qualifying assets $ 49,642,370 $ 52,974,400 52,922,105
Capitalized interest $ 2,875,034 $ 2,861,307 $ 3,524,841
Capitalization rate 5.80% 5.40% 6.70%