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Share-based Compensation (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation | $ 2,100 |  | $ 1,200 |  | $ 4,243 | $ 3,415 |
Proceeds from stock options exercised |  |  |  |  | $ 1,424 | $ 279 |
Shares withheld for employee taxes |  |  |  |  | 0.0 | 0.0 |
Common Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares withheld for employee taxes |  | 5,000 |  | 1,000 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation | 1,000 |  | 700 |  | $ 2,500 | $ 2,200 |
Total income tax benefit recognized related to restricted stock awards | 300 |  | 200 |  | $ 900 | 1,500 |
Compensation cost recognition weighted average period |  |  |  |  | 1 year 9 months 18 days |  |
Share-based compensation arrangement, fair value of awards vested |  |  |  |  | $ 3,400 | $ 4,100 |
Shares granted in period |  |  |  |  | 43,000 | 28,000 |
Shares vested in period |  |  |  |  | 30,000 | 32,000 |
Unrecognized compensation costs | 4,600 |  |  |  | $ 4,600 |  |
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 | 200 |  |  |  | $ 200 |  |
Compensation cost recognition weighted average period |  |  |  |  | 2 years 2 months 12 days |  |
Weighted-average remaining contractual life of options outstanding |  |  |  |  | 6 years |  |
Aggregate intrinsic value of options outstanding | 7,800 |  |  |  | $ 7,800 |  |
Weighted-average remaining contractual life of options exercisable |  |  |  |  | 5 years 6 months |  |
Aggregate intrinsic value of options exercisable | $ 5,900 |  |  |  | $ 5,900 |  |
Intrinsic value of options exercised |  |  |  |  | $ 1,100 | $ 1,000 |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation cost recognition weighted average period |  |  |  |  | 2 years |  |
Share-based compensation arrangement shares to be issued | 44,162 |  |  |  | 44,162 |  |
Shares vested in period |  |  |  |  |  |  | 273,300
Unrecognized compensation costs | $ 4,800 |  |  |  | $ 4,800 |  |
Performance Shares [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation |  |  | 200 |  |  | $ 500 |
Shares granted 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 |  |  |  |  |  | $ 200 |
Performance Shares [Member] | Key Executives [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation |  |  | 100 |  |  |  |
Shares granted in period |  |  |  |  |  | 63,300 |
Granted in 2019 [Member] | Performance Shares [Member] | Certain Key Executive [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation | 500 |  | $ 200 |  | $ 800 | $ 500 |
Shares granted in period |  |  |  |  | 16,637 | 17,780 |
Granted in 2020 [Member] | Performance Shares [Member] | Certain Key Executive [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | $ 900 |  |
Shares granted in period |  |  |  |  | 27,525 |  |
Granted in 2020 [Member] | Performance Shares [Member] | Key Executives [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation | $ 600 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation, shares authorized under stock option plans, exercise price range, lower range limit |  |  |  |  | $ 26.52 |  |
Minimum [Member] | Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation, shares authorized under stock option plans, exercise price range, upper range limit |  |  |  |  | $ 171.68 |  |
Maximum [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 5 years |  |
Maximum [Member] | Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award expiration period |  |  |  |  | 10 years |  |

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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=120381028&loc=d3e5070-113901 + Details
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