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Stock compensation plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | May 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Maximum number of common stock authorized to be issued under plan (in shares) |  |  |  | 4,300,000
Number of options, granted (in shares) | 193,826 |  |  |
Unrecognized compensation expense | $ 41.5 |  |  |
Shares available for future grants (in shares) | 3,583,530 |  |  |
Stock option granted, weighted average grant date fair value (in dollars per share) | $ 70.28 | $ 76.46 | $ 88.92 |
Stock option granted, weighted average grant date fair value | $ 4.7 | $ 13.5 | $ 5.0 |
Stock option expenses including selling general and administrative expenses | $ 12.8 |  |  |
Non-vested restricted stock units issued (in shares) | 108,777 | 98,201 | 85,780 |
Non vested restricted stock expense including selling general and administrative expense | $ 17.6 |  |  |
Performance Shares Units (PSUs) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance period | 3 years |  |  |
Weighted average grant date fair value, granted (in dollars per share) | $ 220.45 |  |  |
Performance Shares Units (PSUs) | Minimum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Grant of stock awards (in shares) | 45,052 |  |  |
Performance Shares Units (PSUs) | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Grant of stock awards (in shares) | 111,696 |  |  |
Restricted Stock Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Grant of stock awards (in shares) | 108,777 |  |  |
Weighted average grant date fair value, granted (in dollars per share) | $ 220.18 | $ 235.14 | $ 323.35 |
Common Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of options, granted (in shares) | 193,826 |  |  |
Restricted Stock Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Grant of stock awards (in shares) | 108,777 |  |  |
Stock Option |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense | $ 13.7 |  |  |
Period for recognition | 1 year 6 months |  |  |
Restricted Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense | $ 20.3 |  |  |
Period for recognition | 1 year 3 months 18 days |  |  |

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