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Financial Risk Management - Schedule of Reconciliation by Risk Category of Components of Equity and Analysis of OCI Items and Net of Tax (Detail) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flow hedges    
Balance on January 1 $ (172,094)  
Balance at December 31 (471,107) $ (172,094)
Hedge Reserve [Member]    
Cash flow hedges    
Balance on January 1 (172,094)  
Changes in fair value (413,672) (247,981)
Amount reclassified to profit or loss (13,490) (1,045)
Changes in deferred tax asset 128,149 76,931
Balance at December 31 $ (471,107) $ (172,094)