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Stock compensation plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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) | 189,388 |  |
Unrecognized compensation expense | $ 41.5 |  |
Shares available for future grants (in shares) | 3,939,853 |  |
Stock option granted, weighted average grant date fair value (in dollars per share) | $ 76.46 | $ 88.92 | $ 103.87
Stock option granted, weighted average grant date fair value | $ 13.5 | $ 5.0 | $ 27.4
Stock option expenses including selling general and administrative expenses | $ 11.8 |  |
Non-vested restricted stock units issued (in shares) | 98,201 | 85,780 | 59,210
Non vested restricted stock expense including selling general and administrative expense | $ 16.8 |  |
Common Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of options granted (in shares) | 189,388 |  |
Restricted Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of stock awards (in shares) | 98,201 |  |
Stock Option |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 14.9 |  |
Period for recognition | 1 year 7 months 6 days |  |
Restricted Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 21.2 |  |
Period for recognition | 1 year 4 months 24 days |  |
Stock Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award share count (in shares) | 1 |  |
Restricted Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of stock awards (in shares) | 98,201 |  |
Weighted average grant date fair value (in dollars per share) | $ 235.14 | $ 323.35 | $ 398.59
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 (in dollars per share) | $ 244.08 |  |
RSU And Performance Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock award share count (in shares) | 2.6 |  |
Maximum | Performance Shares Units (PSUs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of stock awards (in shares) | 85,772 |  |
Minimum | Performance Shares Units (PSUs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of stock awards (in shares) | 34,256 |  |

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