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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 12 Months Ended | 260 Months Ended | 360 Months Ended
--- | --- | --- | --- | ---
May 05, 2020 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2016 | Dec. 31, 2023 | Dec. 31, 2023
Class of Stock [Line Items] |  |  |  |  |  |  |
Cumulative shares repurchased |  |  |  |  |  |  | 149,644
Issuance of shares under stock purchase plan |  |  |  |  |  | 14,814 |
Total intrinsic value of options exercised |  | $ 46,000 | $ 34,000 | $ 82,000 |  |  |
Total unrecognized share-based compensation cost |  | $ 53,000 |  |  |  | $ 53,000 | $ 53,000
Unrecognized share-based compensation cost, weighted average period |  | 1 year 8 months 12 days |  |  |  |  |
The Amended 2017 Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares authorized for grant | 5,500 |  |  |  |  |  |
Weighted average fair value of award granted during the period |  | $ 113.28 | $ 102.65 | $ 113.82 |  |  |
Shares available for granting of awards |  | 1,577 |  |  |  | 1,577 | 1,577
The Amended 2017 Plan | Upper End | Director |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Fair value of annual equity award grant per participant |  | $ 600 |  |  |  |  |
The Amended 2017 Plan | Upper End | Board of Directors Chairman |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Fair value of annual equity award grant per participant |  | $ 800 |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |
Number of common stock issued per unit based award upon vesting |  | 100.00% |  |  |  |  |
Weighted average fair value of award granted during the period |  | $ 113.28 |  |  |  |  |
Number of shares, unvested |  | 642 | 707 |  |  | 642 | 642
Shares granted |  | 365 |  |  |  |  |
Weighted average grant date fair value of shares unvested |  | $ 109.78 | $ 99.09 |  |  | $ 109.78 | $ 109.78
Number of unsettled shares, vested |  | 410 |  |  |  |  |
Weighted average grant date fair value of shares vested |  | $ 94.54 |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Weighted average fair value of award granted during the period |  | $ 113.24 |  |  |  |  |
Number of shares, unvested |  | 0 |  |  |  | 0 | 0
Shares granted |  | 14 |  |  |  |  |
Performance Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of common stock issued per unit based award upon vesting |  | 100.00% |  |  |  |  |
Number of shares, unvested |  | 164 |  |  |  | 164 | 164
Shares granted |  | 78 | 84 | 75 |  |  |
Maximum Adjustment Factor |  | 200.00% |  |  |  |  |
Minimum Adjustment Factor |  | 50.00% |  |  |  |  |
Shares issued if minimum performance thresholds are not achieved |  | 0 |  |  |  |  |
Weighted average grant date fair value of shares unvested |  | $ 113.54 |  |  |  | $ 113.54 | $ 113.54
Number of unsettled shares, vested |  | 114 |  |  |  |  |
Weighted average grant date fair value of shares vested |  | $ 113.71 |  |  |  |  |
Employee Stock Option Plan | Upper End |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Maximum contractual term |  |  |  |  | 10 years |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares authorized for grant |  | 15,305 |  |  |  | 15,305 | 15,305
Purchase price percentage of fair market value |  | 85.00% |  |  |  |  |
Amount withheld employee stock purchase plan |  | $ 25,125 |  |  |  | $ 25,125 | $ 25,125

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