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Income Tax Expense - Additional information (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Income Tax Expense [Line Items] |  |  |  |
Corporate tax rate |  |  |  | 20.00%
Allowed Percentage deduction of research and development expenses |  |  | 100.00% |
Dividend payments, withholding tax |  |  | 15.00% |
Percentage of the profits arising from sale of affiliate shares, founders' shares, redeemed shares and preemptive rights held by entities for corporate tax exception |  |  | 75.00% |
Tax exception minimum withhold period from sale of affiliate shares, founders' shares, redeemed shares and preemptive rights |  |  | 2 years |
Percentage of profits arising from sale of immovable properties included in assets entities for corporate tax exception |  |  | 50.00% |
Tax exception minimum withhold period from sale of immovable properties |  |  | 2 years |
Percentage of income tax exemption |  |  | 75.00% |
Minimum term for profits recorded under passive fund account without withdrawal for tax exception |  |  | 5 years |
Changes in tax rates or tax laws enacted or announced [member] |  |  |  |
Disclosure of Income Tax Expense [Line Items] |  |  |  |
Corporate tax rate | 22.00% | 22.00% | 22.00% |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Allowable percentage deduction of research and development expenses. + References No definition available. + Details
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- Definition Disclosure of income tax expense. + References No definition available. + Details
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- Definition Dividends paid withholding tax. + References No definition available. + Details
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- Definition Percentage of income tax exemption. + References No definition available. + Details
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- Definition Percentage of profits arising from sale of immovable properties included in assets entities for corporate tax exception. + References No definition available. + Details
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- Definition Percentage of the profits arising from sale of affiliate shares, founders' shares, redeemed shares and preemptive rightsheld by entities for corporate tax exception. + References No definition available. + Details
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- Definition Tax exception minimum withhold period from sale of affiliate shares, founders' shares, redeemed shares and preemptive rights. + References No definition available. + Details
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- Details
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