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Shareholder's capital - Bonus Deferral RSUs (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Treasury Stock, Common |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued from treasury to settles RSUs and PSUs (in shares) | 31,455 | 82,886
Common shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares) | 37,660 | 95,482
Retirement Restricted Share Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards vested (percent) | 100.00% |
Bonus Deferral Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued during period (in shares) | 77,981 | 55,445
Deferred Share Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued during period (in shares) | 724,583 | 645,714
Common stock, shares issued (in shares) | 69,115 | 178,368
Awards outstanding (in shares) | 167,352 | 158,486

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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