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Earnings per Share - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021
2013 Equity Compensation Plan | Performance Stock Units |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, additional shares issued | 0 |  | 42,626
Total fair value of vested shares |  |  | $ 784,000
Share based compensation arrangement by share based payment award equity instruments other than options, grant date |  |  | Mar. 24, 2021
Stock options, expiration term from date of grant |  |  | 3 years
Share-based compensation arrangement by share based payment award, performance stock units outstanding | 66,563 | 0 | 66,563
Share-based compensation arrangement by share based payment award, performance stock units aggregate grant fair value |  |  | $ 1,000
Stock option awards |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive securities excluded from computation of diluted EPS (shares) | 0 | 0 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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