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Shareholders' capital - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 2 Months Ended | 12 Months Ended | 61 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 08, 2024 USD ($) | Mar. 03, 2022 | Mar. 02, 2022 | Dec. 31, 2023 USD ($) vote right shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2022 $ / shares | Mar. 08, 2024 USD ($) $ / shares shares | Dec. 31, 2023 $ / shares | Aug. 15, 2022 USD ($)
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Number of entitled votes per common share | vote |  |  |  | 1 |  |  |  |  |  |
Number of voting rights per share | right |  |  |  | 1 |  |  |  |  |  |
Discount rate on share purchases (percent) |  |  |  | 50.00% |  |  |  |  |  |
Dividend declared per preferred share (USD per share) | $ / shares |  |  |  |  | $ 1.6440 |  |  |  |  |
Preferred dividend rate reset period |  |  |  | 5 years |  |  |  |  |  |
Total share-based compensation | $ |  |  |  | $ 11,293 |  | $ 10,920 |  |  |  |
Unrecognized compensation costs, non-vested awards | $ |  |  |  | $ 23,883 | $ 23,883 |  |  |  |  |
Unrecognized compensation costs, non-vested options, period of recognition |  |  |  | 1 year 9 months 18 days |  |  |  |  |  |
Common shares issued from treasury (in shares) |  |  |  | 50,677 |  |  |  |  |  |
Share based awards settled for cash value as payment for tax withholding (in shares) |  |  |  | 51,783 |  |  |  |  |  |
Company Match, First $5,000 Contributed by Employee |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Employer matching contribution (percent) |  |  |  | 20.00% |  |  |  |  |  |
Employee contribution eligible for 20% Company match | $ |  |  |  | $ 5 |  |  |  |  |  |
Maximum employee contribution eligible for partial Company match | $ |  |  |  | $ 10 |  |  |  |  |  |
Company Match, Employee Contributions $5,001 to $10,000 |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Employer matching contribution (percent) |  |  |  | 10.00% |  |  |  |  |  |
Share options |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued pursuant to public offering (in shares) |  |  |  | 752,582 |  | 414,338 |  |  |  |
Total share-based compensation | $ |  |  |  | $ 1,325 |  | $ 980 |  |  |  |
Percentage of shares reserved under the plan (must not exceed) |  |  |  | 8.00% |  |  |  |  |  |
ESPP |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period of matching contribution shares |  |  |  | 1 year |  |  |  |  |  |
Maximum aggregate number of shares reserved for future issuance (in shares) |  |  |  | 4,000,000 | 4,000,000 |  |  |  |  |
Deferred Share Units |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum aggregate number of shares reserved for future issuance (in shares) |  |  |  | 1,000,000 | 1,000,000 |  |  |  |  |
Exercise of share-based awards settled (in shares) |  |  |  | 181,328 |  | 120,513 |  |  |  |
Shares issued during period (in shares) |  |  |  | 724,583 |  | 645,714 |  |  |  |
Performance and restricted share units |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum aggregate number of shares reserved for future issuance (in shares) |  |  |  | 7,000,000 | 7,000,000 |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |  |  |  |  |
Series A Shares |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend declared per preferred share (USD per share) | $ / shares |  |  |  |  | $ 1.2905 |  | $ 1.2905 |  |  |
Preferred dividend rate reset period |  |  |  | 5 years |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.94% |  |  |  |  |  |
Shares issued, price per share (USD and CAD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 25 |
Series D Shares |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend declared per preferred share (USD per share) | $ / shares |  |  |  |  | $ 1.2728 |  | $ 1.2728 |  |  |
Preferred dividend rate reset period |  |  |  | 5 years |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.28% |  |  |  |  |  |
Shares issued, price per share (USD and CAD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 25 |
Common shares |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Discount rate on share purchases under dividend reinvestment plan (percent) |  | 3.00% | 5.00% |  |  |  |  |  |  |
Common shares | Public Stock Offering |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise of share-based awards settled (in shares) |  |  |  | 102,460 |  | 5,176 |  |  |  |
ATM Equity Program |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock, amount reserved for issuance under the plan | $ |  |  |  |  |  |  |  |  |  | $ 500,000
ATM Equity Program | Subsequent Event |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued pursuant to public offering (in shares) |  |  |  |  |  |  |  | 36,814,536 |  |
Sale of stock, average price per share (in USD) | $ / shares |  |  |  |  |  |  |  | $ 15.00 |  |
Sale of stock, other related costs | $ | $ 4,843 |  |  |  |  |  |  | $ 551,086 |  |
Proceeds from sale of stock, net of commissions | $ |  |  |  |  |  |  |  | $ 544,295 |  |
Minimum |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of outstanding stock to be purchased to acquire discount (or more) |  |  |  | 20.00% |  |  |  |  |  |
Minimum | Performance and restricted share units |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of shares issued on number of PSU grants (percent) |  |  |  | 2.50% |  |  |  |  |  |
Maximum | Performance and restricted share units |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of shares issued on number of PSU grants (percent) |  |  |  | 237.00% |  |  |  |  |  |

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