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Shareholder's capital - Share-Based Compensation Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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 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 + Details
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