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Shareholder's capital - Share-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	$ 11,293	$ 10,920
Share options
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	1,325	980
Director deferred share units
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	949	960
Employee share purchase
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	897	562
Performance and restricted share units
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	$ 8,122	$ 8,418

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- Definition

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

+ References

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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