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Subsequent events (Detail)
$ in Millions
 1 Months Ended 12 Months Ended
Feb. 11, 2026
$ / shares
Feb. 26, 2026
USD ($)
award
shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Disclosure of non-adjusting events after reporting period [line items]          
Share-based compensation expense     $ 5.7 $ 5.5 $ 4.4
Dividend Plan          
Disclosure of non-adjusting events after reporting period [line items]          
Dividends payable (in dollars per share) | $ / shares 1.71        
Percentage of dividends payable 0.40        
Announcement of new equity awards          
Disclosure of non-adjusting events after reporting period [line items]          
Number of share-based compensation awards approved | award   5      
Number of shares authorized for grant (in shares) | shares   57,916      
Fair value of non-vested stock awards   $ 8.5      
Share-based compensation expense   $ 3.4      
Announcement of new equity awards | Bottom of range          
Disclosure of non-adjusting events after reporting period [line items]          
Share-based arrangement, vesting period   3 years      
Announcement of new equity awards | Top of range          
Disclosure of non-adjusting events after reporting period [line items]          
Share-based arrangement, vesting period   5 years