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v3.26.1

Shareholders' equity - Additional Information (Detail) - $ / shares | 1 Months Ended |
--- | --- | ---
Jul. 31, 2026 | Jun. 30, 2026
Class of Stock [Line Items] |  |
Preferred stock, shares authorized (in shares) |  | 20,000,000
Preferred stock, par value (in dollars per share) |  | $ 1.00
Preferred Series L | Subsequent Event |  |
Class of Stock [Line Items] |  |
Stock Issued During Period, Shares, New Issues | 60,000 |
Preferred stock, liquidation preference per share (in USD per share) | $ 10,000 |
Preferred stock dividend rate (as a percent) | 6.625% |

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