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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Capitalized interest $ 1,771,613 $ 2,233,358 $ 2,020,288
Capitalization rate 3.72% 4.16%  
Property, plant and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount invested in the acquisition of qualifying assets $ 46,528,232 $ 50,783,957 45,456,630
Capitalized interest $ 1,771,613 $ 2,233,358 $ 2,020,288
Capitalization rate 3.80% 4.40% 4.40%