Derivative Financial Instruments - Additional Information (Details) (Detail) - MXN ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
changes in fair value of derivative financial instruments gain (loss)	$ (4,686,407)	$ 8,192,567	$ (9,622,233)
Derivatives [member] \| Debt securities [member]
Disclosure of detailed information about financial instruments [line items]
weighted-average interest rate	4.10%	4.00%	3.70%

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 2018-01-01
-Paragraph 20
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20&doctype=Standard
-URIDate 2018-03-16

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Period Type:	duration