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Earnings Per Share ("EPS") - Schedule of Reconciliation of Weighted Average Shares Used in Diluted EPS (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Line Items]
Weighted average common shares-basic	18,413,756	18,050,551	18,409,331	18,015,308
Effect of dilutive securities
Weighted average common shares-diluted	18,835,560	18,343,038	18,811,356	18,288,050
Stock Options And Stock Purchase Plan [Member]
Effect of dilutive securities
Effect of diluted securities	327,171	156,109	318,047	115,560
Restricted Stock Units [Member]
Effect of dilutive securities
Effect of diluted securities	94,633	136,378	83,978	157,182

X

- Definition

Earnings per share.

+ References

No definition available.

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 28A
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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.

+ References

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