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Financial Risk Management - Summary of Items Designated as Hedging Instruments and Hedge Ineffectiveness (Detail) - Interest rate swaps [Member]
$ in Thousands
 12 Months Ended
Dec. 31, 2020
MXN ($)
HedgingInstrument
Dec. 31, 2019
MXN ($)
HedgingInstrument
Disclosure Of Detailed Information About Hedging Instruments [Line Items]    
Nominal amount | HedgingInstrument 8,300,000 5,300,000
Carrying amount (Liabilities) $ (676,188) $ (247,981)
Line item in the statement of financial position where the hedging instrument is included Derivative financial instruments (liabilities) Derivative financial instruments (liabilities)
Changes in the value of the hedging instrument recognized in OCI $ (413,672) $ (247,981)
Amount reclassified from costs of hedging reserve to profit or loss $ (13,490) $ (1,045)
Line item in profit or loss affected by the reclassification Finance costs Finance costs