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Stock compensation plans- Summary of stock option activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Number of options, outstanding, beginning of year (in shares) | shares 1,293,775
Number of options, granted (in shares) | shares 193,826
Number of options, exercised (in shares) | shares (50,465)
Number of options, forfeited or expired (in shares) | shares (43,382)
Number of options, outstanding, ending of year (in shares) | shares 1,393,754
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Weighted average exercise price, outstanding, beginning of year (in dollars per share) | $ / shares $ 239.55
Weighted average exercise price, granted (in dollars per share) | $ / shares 223.94
Weighted average exercise price, exercised (in dollars per share) | $ / shares 135.91
Weighted average exercise price, forfeited or expired (in dollars per share) | $ / shares 294.22
Weighted average exercise price, outstanding, beginning of year (in dollars per share) | $ / shares $ 239.43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Number of options, exercisable, end of year (in shares) | shares 1,052,394
Weighted average exercise price, exercisable, end of year (in dollars per share) | $ / shares $ 238.65
Weighted average remaining contractual life in years, outstanding, end of year 4 years 6 months
Weighted average remaining contractual life in years, exercisable, end of year 3 years 2 months 12 days
Aggregate intrinsic value, outstanding, end of year | $ $ 13,718
Aggregate intrinsic value, exercisable, end of year | $ $ 13,718