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Finance Cost - Net - Summary of Net Finance (Cost) Income (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Finance Income Expense [Abstract]      
Interest income from cash equivalents $ 313,837 $ 464,499 $ 393,529
Interest on recovered taxes 19,236 22,691 1,472
Gain on derivative financial instruments 29,100 97,449 115,938
Interests in favor of hedge 9,173 71,854 44,292
Other 39,166 9,336 21,463
Total finance income 410,512 665,829 576,694
Interest cost from bank loans (228,689) (177,504) (151,971)
Interest cost from hedges (171,353) (1,284)  
Loss in market value (72,878) (247,219) (86,295)
Other financing costs (52,109) (23,967) (29,891)
Interest cost for debt securities (989,221) (975,772) (744,254)
Total finance cost (1,514,250) (1,425,746) (1,012,411)
Exchange gain 3,048,706 1,187,240 1,422,685
Exchange loss (3,379,190) (1,098,455) (1,223,001)
Exchange gain - Net (330,484) 88,785 199,684
Finance cost - Net $ (1,434,222) $ (671,132) $ (236,033)