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Shareholder's capital - Share-Based Compensation Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items] |  |
Share-based compensation expense | $ 24,637 | $ 11,042
Share options |  |
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items] |  |
Share-based compensation expense | 1,743 | 1,288
Director deferred share units |  |
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items] |  |
Share-based compensation expense | 870 | 798
Employee share purchase |  |
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items] |  |
Share-based compensation expense | 511 | 322
Performance and restricted share units |  |
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items] |  |
Share-based compensation expense | $ 21,513 | $ 8,634

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