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Shareholders' capital - Preferred Shares (Detail) $ / shares in Units, $ in Thousands, $ in Thousands | Dec. 31, 2023 USD ($) shares | Dec. 31, 2023 CAD ($) $ / shares shares | Dec. 31, 2022 USD ($)
--- | --- | --- | ---
Stockholders Equity Note [Line Items] |  |  |
Preferred shares | $ | $ 184,299 |  | $ 184,299
Series A Shares |  |  |
Stockholders Equity Note [Line Items] |  |  |
Preferred stock issued (in shares) | shares | 4,800,000 | 4,800,000 |
Shares issued, price per share (USD and CAD per share) | $ / shares |  | $ 25 |
Preferred shares | $ 100,463 | $ 116,546 |
Series D Shares |  |  |
Stockholders Equity Note [Line Items] |  |  |
Preferred stock issued (in shares) | shares | 4,000,000 | 4,000,000 |
Shares issued, price per share (USD and CAD per share) | $ / shares |  | $ 25 |
Preferred shares | $ 83,836 | $ 97,259 |

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 Reference 2: 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(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481372/852-10-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: 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(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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