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Income Tax - Additional Information (Detail) - HKD ($) $ in Millions	12 Months Ended
	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%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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-SubTopic 10
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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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-Name Accounting Standards Codification
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