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Retirement Employee Benefits - Summary of Amounts Recognized in Consolidated Statement of Profit or Loss and Other Comprehensive Income (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Defined Benefit Plans [Abstract]      
Current service cost $ 18,745 $ 13,152 $ 12,775
Interest cost 13,245 12,048 8,907
Actuarial gains (607) (115) (3,359)
Cost per service passed for modification or reduction     (10,858)
Cost per service for plan modification   956  
Benefits paid (16,798) (3,308)  
Components of defined benefit costs recognized in net income (Note 24) 14,585 22,735 7,465
Measurement of net defined benefit liability:      
Actuarial losses arising from changes in financial and demographic assumptions recognized in other comprehensive income 23,797 1,404 161
Total recognized as employee benefit cost $ 38,382 $ 24,139 $ 7,626