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Stock-Based Compensation - Information about Options Exercised (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award Options Activity [Abstract] |  |  |  |  |
Options exercised | 10,000 |  | 10,000 | 10,000 | 10,000
Total intrinsic value of exercised options |  |  |  | $ 288 | $ 347
Tax benefits realized |  | $ (3) |  | $ 71 | $ 85

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- Definition Amount of tax benefit from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 + 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=120381028&loc=d3e5070-113901 + Details
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