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Share-based Compensation (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended | 36 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | May 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation | $ 4,520 | $ 3,124 | $ 4,267 |  |
Proceeds from stock options exercised | $ 278 | $ 547 | $ 568 |  |
Share-based compensation arrangement shares to be issued |  |  |  |  | 1,600,000
Common Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares withheld for employee taxes | 128,000 | 7,000 | 44,000 |  |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation | $ 2,900 | $ 2,200 | $ 3,400 |  |
Total income tax benefit recognized related to restricted stock awards | $ 7,500 | 2,500 | 2,100 |  |
Compensation cost recognition weighted average period | 1 year 10 months 24 days |  |  |  |
Award vesting period | 5 years |  |  |  |
Share-based compensation arrangement, fair value of awards vested | $ 4,700 | $ 8,600 | 6,800 |  |
Shares granted in period | 29,000 | 19,000 |  |  |
Shares vested in period | 37,000 | 91,000 |  |  |
Unrecognized compensation costs | $ 2,700 |  |  | $ 2,700 |
Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee service share based compensation nonvested awards total compensation cost not yet recognized | $ 500 |  |  | 500 |
Compensation cost recognition weighted average period | 2 years 7 months 17 days |  |  |  |
Weighted-average remaining contractual life of options outstanding | 7 years 1 month 9 days |  |  |  |
Aggregate intrinsic value of options outstanding | $ 5,700 |  |  | 5,700 |
Weighted-average remaining contractual life of options exercisable | 6 years 4 months 2 days |  |  |  |
Aggregate intrinsic value of options exercisable | $ 3,600 |  |  | 3,600 |
Award vesting period | 3 years |  |  |  |
Award expiration period | 10 years |  |  |  |
Share-based compensation, shares authorized under stock option plans, exercise price range, lower range limit | $ 26.52 |  |  |  |
Share-based compensation, shares authorized under stock option plans, exercise price range, upper range limit | $ 171.68 |  |  |  |
Intrinsic value of options exercised | $ 1,000 | $ 4,100 |  |  |
Stock Options [Member] | Common Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares withheld for employee taxes | 1,000 | 6,000 |  |  |
Performance Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation cost recognition weighted average period | 2 years |  |  |  |
Shares granted in period | 17,780 |  |  |  |
Unrecognized compensation costs | $ 1,600 |  |  | 1,600 |
Performance Shares [Member] | Chief Executive Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation |  |  |  | $ 600 |
Shares vested in period | 210,000 |  |  |  |
Performance Shares [Member] | Certain Key Executive [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation | $ 300 | $ 300 | $ 300 |  |
Shares vested in period | 63,300 |  |  |  |
Performance Shares [Member] | Key Executives [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation | $ 700 |  |  |  |
Shares granted in period | 17,780 |  |  |  |

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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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