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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 276 Months Ended | 336 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2016 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of incentive compensation to acquire shares, maximum | 50.00% |  |  |  |  |  |
Percentage of discount rate to market value on the incentive compensation | 20.00% |  |  |  |  |  |
Common stock price | $ 498.91 |  |  |  | $ 498.91 | $ 498.91 |
Aggregate intrinsic values of options exercised | $ 2.6 | $ 1.3 | $ 2.3 |  |  |  |
Aggregate intrinsic values for options exercisable | $ 2.2 |  |  |  | $ 2.2 | $ 2.2 |
Awards available for grant | 400,000 |  |  |  | 400,000 | 400,000 |
Additional shares issuance under the plan |  |  |  | 800,000 |  |  |
Total tax benefits related to stock-based compensation expense | $ 8.6 | $ 7.6 | $ 7.9 |  |  |  |
Options granted in 2015 and 2014 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Employee stock options expiration date | 10 years |  |  |  |  |  |
Incentive Compensation Stock Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grant-date fair value of stock awards, granted | $ 362.08 | $ 369.05 | $ 325.3 |  |  |  |
Aggregate intrinsic values for stock awards | $ 3.6 |  |  |  | $ 3.6 | $ 3.6 |
Common stock price | $ 498.91 |  |  |  | $ 498.91 | $ 498.91 |
Aggregate intrinsic values of stock awards, distributed | $ 3.9 | $ 3.1 | $ 4.9 |  |  |  |
Awards granted | 4,012 |  |  |  |  |  |
Restricted Stock - Service Based Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grant-date fair value of stock awards, granted | $ 369.18 | $ 362.77 | $ 342.11 |  |  |  |
Awards granted | 60,982 |  |  |  |  |  |
Restricted Stock - Performance Based Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grant-date fair value of stock awards, granted | $ 392.73 | $ 406.99 | $ 352.52 |  |  |  |
Awards granted | 33,103 |  |  |  |  |  |
Restricted Stock Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate intrinsic values for stock awards | $ 154.1 |  |  |  | $ 154.1 | $ 154.1 |
Aggregate intrinsic values of stock awards, distributed | $ 47.6 | $ 64.5 | $ 41.1 |  |  |  |
Shareholder Value Achievement Plan (1996) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  |  |  |  | 300,000
Common stock issued under the plan |  |  |  |  |  | 42,025 |
Awards granted |  |  |  |  | 0 |  |
Directors' Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock reserved for future issuance | 300,000 |  |  |  | 300,000 | 300,000 |
Common stock issued under the plan | 1,333 | 1,767 | 1,686 |  |  |  |

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