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Income Tax (Credit) / Expense - Additional Information (Detail) - HK [Member] - HKD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 28, 2018 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax [Line Items] |  |  |  |  |
Applicable tax rate | 16.50% | 16.50% | 16.50% | 16.50% | 16.50%
Tax Rate Applicable on Profit of First Two Million Hong Kong Dollars [Member] |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Applicable tax rate |  | 8.25% | 8.25% | 8.25% |
Threshold limit Of taxable income on which tax is applicable |  | $ 2 | $ 2 | $ 2 |
Tax Rate Applicable on Profit of First Two Million Hong Kong Dollars [Member] | Intoduction Of Two Tiered Profits Tax Rates Regime [Member] |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Applicable tax rate | 8.25% |  |  |  |
Threshold limit Of taxable income on which tax is applicable | $ 2 |  |  |  |
Tax Rate Applicable on Profit of Above Two Million Hong Kong Dollars [Member] |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Applicable tax rate |  | 16.50% | 16.50% | 16.50% |
Threshold limit Of taxable income on which tax is applicable |  | $ 2 | $ 2 | $ 2 |
Tax Rate Applicable on Profit of Above Two Million Hong Kong Dollars [Member] | Intoduction Of Two Tiered Profits Tax Rates Regime [Member] |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Applicable tax rate | 16.50% |  |  |  |
Threshold limit Of taxable income on which tax is applicable | $ 2 |  |  |  |

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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 2022-03-24 -Paragraph 81 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2022-03-24 + Details
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