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Stock compensation plans- Summary of stock option activity (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
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 1,157,315
Number of Options, Granted (in shares) | shares 108,686
Number of Options, Exercised (in shares) | shares (125,143)
Number of Options, Forfeited or Expired (in shares) | shares (32,859)
Number of Options, Outstanding, ending of year (in shares) | shares 1,107,999
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 $ 195.57
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares 403.99
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares 175.90
Weighted Average Exercise Price, Forfeited or Expired (in dollars per share) | $ / shares 334.14
Weighted Average Exercise Price, Outstanding, beginning of year (in dollars per share) | $ / shares $ 214.13
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Number of Options, Exercisable, end of year (in shares) | shares 908,854
Weighted Average Exercise Price, Exercisable, end of year (in dollars per share) | $ / shares $ 181.31
Weighted Average Remaining Contractual Life in Years, Outstanding, end of year 5 years 1 month 9 days
Weighted Average Remaining Contractual Life in Years, Exercisable, end of year 4 years 4 months 13 days
Aggregate Intrinsic Value, Outstanding, end of year | $ $ 136,520
Aggregate Intrinsic Value, Exercisable, end of year | $ $ 135,036