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Share-based Compensation (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 21 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation | $ 1,200 |  | $ 717 |  | $ 3,415 | $ 2,352 |
Compensation cost recognition weighted average period |  |  |  |  | 2 years 1 month 24 days |  |
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 |  |
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value |  |  |  |  |  | $ 18.08 |
Proceeds from stock options exercised |  |  |  |  | $ 279 | $ 220 |
Common Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares withheld for employee taxes |  | 1,000 |  | 3,000 | 1,000 | 3,000 |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation | 723 |  | 488 |  | $ 2,200 | $ 1,700 |
Total income tax benefit recognized related to restricted stock awards | 249 |  | 167 |  | $ 1,500 | 1,600 |
Compensation cost recognition weighted average period |  |  |  |  | 2 years 3 days |  |
Award vesting period |  |  |  |  | 5 years |  |
Share-based compensation arrangement, fair value of awards vested |  |  |  |  | $ 4,100 | $ 7,500 |
Shares vested in period |  |  |  |  | 32,000 | 86,000 |
Unrecognized compensation costs | 3,300 |  |  |  | $ 3,300 |  | $ 3,300
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 | 600 |  |  |  | $ 600 |  | 600
Compensation cost recognition weighted average period |  |  |  |  | 2 years 9 months 3 days |  |
Weighted-average remaining contractual life of options outstanding |  |  |  |  | 7 years 4 months 9 days |  |
Aggregate intrinsic value of options outstanding | 5,100 |  |  |  | $ 5,100 |  | 5,100
Weighted-average remaining contractual life of options exercisable |  |  |  |  | 6 years 7 months 2 days |  |
Aggregate intrinsic value of options exercisable | $ 3,300 |  |  |  | $ 3,300 |  | $ 3,300
Intrinsic value of options exercised |  |  |  |  | $ 1,000 | $ 1,400 |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation arrangement shares to be issued | 291,080 |  |  |  | 291,080 |  | 291,080
Unrecognized compensation costs | $ 2,100 |  |  |  | $ 2,100 |  | $ 2,100
Performance Shares [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation | 152 |  | 152 |  | 455 | 455 |
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 | $ 205 |  |  |  | $ 497 |  |
Shares vested in period | 17,780 |  |  |  | 17,780 |  |
Performance Shares [Member] | Key Executives [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation | $ 77 |  | $ 77 |  | $ 228 | $ 229 |
Shares vested in period | 63,300 |  | 63,300 |  | 63,300 | 63,300 |
Minimum [Member] | Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 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=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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