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Shareholders' Equity - Additional Information (Detail) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended | 36 Months Ended | 199 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares | Apr. 30, 2016 | Dec. 31, 2018 USD ($) shares | May 02, 2017 shares | May 07, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of shares under stock purchase plan |  |  |  |  | 11,562 |  |
Total intrinsic value of options exercised | $ | $ 92,000 | $ 55,000 | $ 29,000 |  |  |  |
Total unrecognized share-based compensation cost | $ | $ 56,000 |  |  |  | $ 56,000 |  |
Unrecognized share-based compensation cost, weighted average period | 1 year 7 months 6 days |  |  |  |  |  |
2017 Omnibus Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized for grant |  |  |  |  |  | 2,500 |
Shares available for granting of awards | 1,431 |  |  |  | 1,431 |  |
2017 Omnibus Incentive Plan | Upper end |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period | 3 years | 3 years |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Grants in Period | 466 |  |  |  |  |  |
Number of common stock issued per unit based award upon vesting | 1 |  |  |  |  |  |
Weighted average fair value of award granted during the period | $ / shares | $ 69.58 | $ 54.11 |  |  |  |  |
Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Grants in Period | 18 | 23 |  |  |  |  |
Maximum Adjustment Factor | 2 |  |  |  |  |  |
Minimum Adjustment Factor | 0.5 |  |  |  |  |  |
Minimum Shares Issued | 0 |  |  |  |  |  |
Number of common stock issued per unit based award upon vesting | 1 |  |  |  |  |  |
Weighted average fair value of award granted during the period | $ / shares | $ 69.58 | $ 54.11 |  |  |  |  |
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 | 12,305 |  |  |  | 12,305 |  |
Purchase price percentage of fair market value | 85.00% |  |  |  |  |  |
Amount withheld employee stock purchase plan | $ | $ 18,646 |  |  |  | $ 18,646 |  |
Weighted average fair value of award granted during the period | $ / shares | $ 17.49 | $ 11.69 | $ 10.99 |  |  |  |
Directors' Restricted Stock Plan 2014 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized for grant |  |  |  |  |  |  | 250
Grants in Period | 25 |  |  |  |  |  |
Shares available for granting of awards | 81 |  |  |  | 81 |  |
Fair value of annual grant per participant of restricted stock awards | $ | $ 200 |  |  |  |  |  |
Unvested restricted shares | 0 |  |  |  | 0 |  |
Weighted average fair value of award granted during the period | $ / shares | $ 72.19 |  |  |  |  |  |
Non-Discretionary Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized for repurchase | 40,000 |  |  |  | 40,000 |  |
Discretionary Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected common stock shares issued and outstanding | 160,000 |  |  |  | 160,000 |  |

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