Derivative Financial Instruments - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Changes in fair value of derivative financial instruments gain (loss)	$ 12,378,193	$ 4,432,023	$ (4,686,407)
Derivatives [member] \| Debt securities [member]
Disclosure of detailed information about financial instruments [line items]
Weighted-average interest rate	3.50%	(3.80%)	4.10%

Adjustments for gains (losses) on changes in the fair value of derivatives to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: At fair value [member]; Derivatives [member]; Profit (loss)]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 20
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_20&doctype=Standard
-URIDate 2020-01-01

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