Foreign Currency Transactions - Summary of Transactions Denominated in Foreign Currency (Parenthetical) (Detail) $ in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2020 MXN ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 MXN ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 MXN ($)	Dec. 31, 2018 USD ($)
Foreign Currency Transactions [Abstract]
Interest expense	$ 1,514,250	$ 7.7	$ 1,425,746	$ 6.4	$ 1,012,411	$ 6.5

The amount of expense arising from interest.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2020-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration