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Shareholder's capital - Share-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	$ 10,920	$ 8,395
Share options
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	980	939
Director deferred share units
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	960	821
Employee share purchase
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	562	592
Performance and restricted share units
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	$ 8,418	$ 6,043

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- Definition

Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]

+ References

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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