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Financial Risk Management - Summary of Ratio of the Shareholders' Equity to Total Liabilities (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure Of Financial Instruments [Abstract]      
Shareholders’ equity –controlling interest $ 21,792,811 $ 19,628,172 $ 20,708,985
Total liabilities $ 28,508,390 $ 20,908,361 $ 17,778,352
Ratio of total Shareholders’ equity – controlling interest to liabilities 0.8 0.9 1.2