Earnings Per Share (EPS) - Schedule of Reconciliation of Weighted Average Shares Used in the Diluted EPS (Detail) - shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Line Items]
Weighted average common shares-basic	18,494,002	18,117,405	18,144,019
Effect of diluted securities:
Weighted average common shares-diluted	18,911,610	18,498,745	18,463,161
Stock Options And Employee Stock Purchase Plan [Member]
Effect of diluted securities:
Effect of diluted securities	313,648	209,691	161,092
Time-Based Restricted Stock Awards [Member]
Effect of diluted securities:
Effect of diluted securities		123,592	138,291
Performance-based Restricted Stock Awards [Member]
Effect of diluted securities:
Effect of diluted securities	103,960	48,057	19,759

Earnings per share.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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