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Income Tax - Additional Information (Detail) - HKD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Inland Revenue, Hong Kong [Member] |  |  |
Applicable tax rate | 16.50% |  |
Inland Revenue, Hong Kong [Member] | Tax Year 2019 [Member] |  |  |
Tax impact after increase in revenue | $ 2 |  |
Inland Revenue, Hong Kong [Member] | Tax Year 2019 [Member] | Maximum [Member] |  |  |
Applicable tax rate | 16.50% |  |
Inland Revenue, Hong Kong [Member] | Tax Year 2019 [Member] | Minimum [Member] |  |  |
Applicable tax rate | 8.25% |  |
State Administration of Taxation, China [Member] |  |  |
Applicable tax rate | 25.00% |  |
Effective income tax rate | 3.20% | 2.40% | 21.10%
State Administration of Taxation, China [Member] | Domestic Tax Authority [Member] |  |  |
Applicable tax rate | 25.00% |  |
State Administration of Taxation, China [Member] | Foreign Tax Authority [Member] |  |  |
Applicable tax rate | 25.00% |  |
Inland Revenue, Singapore (IRAS) [Member] |  |  |
Applicable tax rate | 17.00% |  |

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