Income Taxes - Summary of Reconciliation Between Tax Expense and Income Before Income Taxes (Detail)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Major components of tax expense (income) [abstract]
Applicable tax rate	30.00%	30.00%	30.00%
Income tax from prior years	(0.38%)	(2.66%)	(0.50%)
(Loss) on monetary position for subsidiaries in hyperinflationary economies	(0.62%)	(0.50%)	(0.96%)
Annual inflation tax adjustment	0.73%	0.78%	(0.32%)
Non-deductible expenses	2.49%	3.92%	2.43%
Non-taxable income	0.00%	0.00%	(0.78%)
Income taxed at a rate other than the Mexican statutory rate	0.08%	1.28%	1.69%
Effect of restatement of tax values	(1.81%)	(1.47%)	(3.38%)
Effect of change in statutory rate	(0.23%)	(0.52%)	(0.38%)
Income tax credits	(10.34%)	(0.18%)	(0.13%)
Tax loss	13.80%	(1.01%)	1.04%
Other	0.04%	1.04%	1.89%
Total	33.76%	30.68%	30.60%

The applicable income tax rate.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2019-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2019-03-27

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- Definition

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

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- Definition

Tax rate effects, in aggregate, on the reconciliation between the average effective tax rate and the applicable tax rate that the entity does not separately disclose in the reconciliation. [Refer: Average effective tax rate; Applicable tax rate]

+ References

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- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from a change in tax rate. [Refer: Average effective tax rate; Applicable tax rate]

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Tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from adjustments for the current tax of prior periods. [Refer: Average effective tax rate; Applicable tax rate; Adjustments for current tax of prior periods]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 12
-IssueDate 2019-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2019-03-27

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- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the expenses not deductible in determining taxable profit. [Refer: Average effective tax rate; Applicable tax rate]

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The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from revenue that is exempt from taxation. [Refer: Average effective tax rate; Applicable tax rate]

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The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from tax losses. [Refer: Average effective tax rate; Applicable tax rate]

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Percentage of tax effect of income tax credits

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Tax rate effect of annual inflation tax adjustment

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Tax rate effect of effect of restatement of tax values

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Tax rate effect of income ( loss) on monetary position for subsidiaries in hyperinflationary economies

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Tax rate effect of income taxed at a rate other than statutory rate

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No definition available.

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