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Stock compensation plans- Summary of stock option activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
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 1,107,999
Number of options, granted (in shares) | shares 156,918
Number of options, exercised (in shares) | shares (27,518)
Number of options, forfeited or expired (in shares) | shares (8,551)
Number of options, outstanding, ending of year (in shares) | shares 1,228,848
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 $ 214.13
Weighted average exercise price, granted (in dollars per share) | $ / shares 330.03
Weighted average exercise price, exercised (in dollars per share) | $ / shares 95.07
Weighted average exercise price, forfeited or expired (in dollars per share) | $ / shares 359.54
Weighted average exercise price, outstanding, beginning of year (in dollars per share) | $ / shares $ 230.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Number of options, exercisable, end of year (in shares) | shares 990,842
Weighted average exercise price, exercisable, end of year (in dollars per share) | $ / shares $ 201.19
Weighted average remaining contractual life in years, outstanding, end of year 4 years 9 months 7 days
Weighted average remaining contractual life in years, exercisable, end of year 3 years 10 months 2 days
Aggregate intrinsic value, outstanding, end of year | $ $ 66,774
Aggregate intrinsic value, exercisable, end of year | $ $ 66,746