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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Maximum number of common stock authorized to be issued under plan (in shares) | 5,300,000 |  |
Number of options granted (in shares) | 156,918 |  |
Unrecognized compensation expense | $ 45.0 |  |
Shares available for future grants (in shares) | 2,843,121 |  |
Stock option granted, weighted average grant date fair value (in dollars per share) | $ 88.92 | $ 103.87 | $ 74.60
Stock option granted, weighted average grant date fair value | $ 5.0 | $ 27.4 | $ 77.9
Stock option expenses including selling general and administrative expenses | $ 10.3 |  |
Non-vested restricted stock units issued (in shares) | 85,780 | 59,210 | 52,464
Non vested restricted stock expense including selling general and administrative expense | $ 15.7 |  |
Common Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of options granted (in shares) | 156,918 |  |
Restricted Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of restricted stock awards (in shares) | 85,780 |  |
Stock Option |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 12.2 |  |
Period for recognition | 1 year 7 months 24 days |  |
Restricted Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 21.2 |  |
Period for recognition | 1 year 6 months |  |
Restricted Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of restricted stock awards (in shares) | 85,780 |  |
Weighted average grant date fair value (in dollars per share) | $ 323.35 | $ 398.59 | $ 344.70
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) | $ 301.00 |  |
Maximum | Performance Shares Units (PSUs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of restricted stock awards (in shares) | 62,927 |  |
Minimum | Performance Shares Units (PSUs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of restricted stock awards (in shares) | 25,131 |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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