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Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail) | 6 Months Ended |
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Jun. 30, 2020 $ / shares shares | Dec. 31, 2019 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Options outstanding at December 31, 2019 (in shares) | shares | 160,500 |
Options granted (in shares) | shares | 0 |
Options exercised (in shares) | shares | (16,000) |
Options forfeited (in shares) | shares | 0 |
Options outstanding at June 30, 2020 (in shares) | shares | 144,500 |
Share based compensation arrangements by share based payment award options outstanding option price per share of options granted (in USD per share) | $ 0 |
Share based compensation arrangements by share based payment award options outstanding option price per share of options forfeited (in USD per share) | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |
Weighted Average Exercise Price at December 31, 2019 (in USD per share) | 17.60 |
Weighted Average Exercise Price of Options Granted (in USD per share) | 0 |
Weighted Average Exercise Price of Options Exercised (in USD per share) | 18.02 |
Weighted Average Exercise Price of Options Forfeited (in USD per share) | 0 |
Weighted Average Exercise Price at June 30, 2020 (in USD per share) | 17.55 |
Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Share based compensation arrangements by share based payment award options outstanding option price per share (in USD per share) | 14.54 | $ 14.54
Share based compensation arrangements by share based payment award options outstanding option price per share of options exercised (in USD per share) | 17.54 |
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Share based compensation arrangements by share based payment award options outstanding option price per share (in USD per share) | 23.21 | $ 23.21
Share based compensation arrangements by share based payment award options outstanding option price per share of options exercised (in USD per share) | $ 19.46 |

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- Definition Share based compensation arrangements by share based payment award options outstanding option price per share. + References No definition available. + Details
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- Definition Share Based Compensation Arrangements By Share Based Payment Award Options Outstanding Option Price Per Share of Options Exercised + References No definition available. + Details
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- Definition Share Based Compensation Arrangements By Share Based Payment Award Options Outstanding Option Price Per Share of Options Forfeited + References No definition available. + Details
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- Definition Share Based Compensation Arrangements By Share Based Payment Award Options Outstanding Option Price Per Share of Options Granted + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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