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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 12 Months Ended | 224 Months Ended | 324 Months Ended
--- | --- | --- | --- | ---
May 05, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2016 | Dec. 31, 2020 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |
Cumulative shares repurchased |  |  |  |  |  |  | 122,969
Issuance of shares under stock purchase plan |  |  |  |  |  | 13,523 |
Total intrinsic value of options exercised |  | $ 82,000 | $ 117,000 | $ 79,000 |  |  |
Total unrecognized share-based compensation cost |  | $ 52,000 |  |  |  |  |
Unrecognized share-based compensation cost, weighted average period |  | 1 year 7 months 6 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 |  | $ 113.82 | $ 74.00 | $ 75.73 |  |  |
Shares available for granting of awards |  | 2,567 |  |  |  |  |
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 |  | $ 113.82 |  |  |  |  |
Shares granted |  | 327 |  |  |  |  |
Weighted average grant date fair value of shares unvested |  | $ 89.74 | $ 73.92 |  |  | $ 73.92 | $ 73.92
Number of unsettled shares, vested |  | 477 |  |  |  |  |
Weighted average grant date fair value of shares vested |  | $ 74.16 |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Weighted average fair value of award granted during the period |  | $ 113.82 |  |  |  |  |
Number of shares, unvested |  | 0 |  |  |  |  |
Shares granted |  | 12 |  |  |  |  |
Performance Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of common stock issued per unit based award upon vesting |  | 100.00% |  |  |  |  |
Number of shares, unvested |  | 173 |  |  |  |  |
Shares granted |  | 75 | 95 | 96 |  |  |
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 |  | $ 90.77 |  |  |  |  |
Number of unsettled shares, vested |  | 200 |  |  |  |  |
Weighted average grant date fair value of shares vested |  | $ 75.73 |  |  |  |  |
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 |  |  |  |  |
Purchase price percentage of fair market value |  | 85.00% |  |  |  |  |
Amount withheld employee stock purchase plan |  | $ 33,073 |  |  |  |  |
Non-Discretionary Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares authorized for repurchase |  | 40,000 |  |  |  |  |
Remaining number of shares authorized for repurchase |  | 0 |  |  |  |  |

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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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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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