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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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) | 130,206 |  |
Unrecognized compensation expense | $ 30.4 |  |
Shares available for future grants (in shares) | 3,183,199 |  |
Stock option granted, weighted average grant date fair value (in dollars per share) | $ 74.60 | $ 68.22 | $ 58.16
Stock option granted, weighted average grant date fair value | $ 77.9 | $ 64.3 | $ 69.4
Stock option expenses including selling general and administrative expenses | $ 9.4 |  |
Non-vested restricted stock units issued (in shares) | 52,464 | 69,799 | 62,221
Non vested restricted stock expense including selling general and administrative expense | $ 14.8 |  |
Common Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of options granted (in shares) | 130,206 |  |
Restricted Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of restricted stock awards (in shares) | 52,464 |  |
Stock Option |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 9.4 |  |
Period for recognition | 1 year 5 months 12 days |  |
Restricted Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 16.2 |  |
Period for recognition | 1 year 2 months 12 days |  |
Restricted Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of restricted stock awards (in shares) | 52,464 |  |
Weighted average grant date fair value (in dollars per share) | $ 344.70 | $ 286.51 | $ 250.66
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) |  | $ 362.78 |
2014 Plan | Stock Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of award shares (in shares) | 1 |  |
2014 Plan | Stock Compensation Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of award shares (in shares) | 1.8 |  |
Prior Plans Before December 31, 2013 | Stock Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of award shares (in shares) | 1 |  |
Prior Plans Before December 31, 2013 | Stock Compensation Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of award shares (in shares) | 1.8 |  |
Prior Plans After January 1, 2014 | Stock Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of award shares (in shares) | 1 |  |
Prior Plans After January 1, 2014 | Stock Compensation Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of award shares (in shares) | 1.8 |  |
Minimum | Performance Shares Units (PSUs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of restricted stock awards (in shares) | 25,818 |  |
Maximum | Performance Shares Units (PSUs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant of restricted stock awards (in shares) | 64,562 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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