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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash And Cash Equivalents [Abstract]        
Cash $ 6,068,555 $ 3,593,756 $ 1,912,047  
Investments of cash surpluses 7,840,689 3,897,894 3,894,166  
Cash equivalents designated for expenditure, held in trust 535,305 8,543 345,244  
Total $ 14,444,549 $ 7,500,193 $ 6,151,457 $ 7,730,143