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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended | 36 Months Ended | 212 Months Ended |
--- | --- | --- | --- | --- | ---
May 02, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2016 | Dec. 31, 2019 | May 07, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Issuance of shares under stock purchase plan (in shares) |  |  |  |  |  |  | 12,147,000 |
Total intrinsic value of options exercised |  | $ 79,000 | $ 92,000 | $ 55,000 |  |  |  |
Total unrecognized share-based compensation cost |  | $ 50,000 |  |  |  |  | $ 50,000 |
Unrecognized share-based compensation cost, weighted average period |  | 1 year 8 months 12 days |  |  |  |  |  |
2017 Omnibus Incentive Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized for grant | 2,500,000 |  |  |  |  |  |  |
Shares available for granting of awards |  | 744,000 |  |  |  |  | 744,000 |
Weighted average fair value of award granted during the period |  | $ 75.73 | $ 69.58 | $ 54.11 |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |
Number of common stock issued per unit based award upon vesting |  | 100.00% |  |  |  |  |  |
Shares Granted |  | 475,000 |  |  |  |  |  |
Weighted average grant date fair value of shares unvested |  | $ 69.54 | $ 62.51 |  |  |  | $ 69.54 |
Weighted average fair value of award granted during the period |  | $ 75.73 |  |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of common stock issued per unit based award upon vesting |  | 100.00% |  |  |  |  |  |
Shares Granted |  | 96,000 | 18,000 |  |  |  |  |
Maximum Adjustment Factor |  | 200.00% |  |  |  |  |  |
Minimum Adjustment Factor |  | 50.00% |  |  |  |  |  |
Shares issued if minimum performance thresholds are not achieved |  | 0 |  |  |  |  |  |
Number of shares, unvested |  | 137,000 | 41,000 |  |  |  | 137,000 |
Weighted average grant date fair value of shares unvested |  | $ 71.28 | $ 60.83 |  |  |  | $ 71.28 |
Employee Stock Option Plan | Upper End |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years | 5 years |  |
Maximum contractual term |  |  |  |  | 10 years |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized for grant |  | 15,305,000 |  |  |  |  | 15,305,000 |
Purchase price percentage of fair market value |  | 85.00% |  |  |  |  |  |
Amount withheld employee stock purchase plan |  | $ 20,466 |  |  |  |  | $ 20,466 |
Directors' Restricted Stock Plan 2014 |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized for grant |  |  |  |  |  |  |  | 250,000
Shares Granted |  | 24,000 |  |  |  |  |  |
Number of shares, unvested |  | 0 |  |  |  |  | 0 |
Shares available for granting of awards |  | 0 |  |  |  |  | 0 |
Fair value of annual grant per participant of restricted stock awards |  | $ 200 |  |  |  |  |  |
Weighted average fair value of award granted during the period |  | $ 73.85 |  |  |  |  |  |
Discretionary Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected common stock shares issued and outstanding |  | 160,000,000 |  |  |  |  | 160,000,000 |
Non-Discretionary Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized for repurchase |  | 40,000,000 |  |  |  |  | 40,000,000 |
Remaining number of shares authorized for repurchase |  | 0 |  |  |  |  | 0 |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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