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Earnings Per Share ("EPS") - Schedule of Reconciliation of Weighted Average Shares Used in Diluted EPS (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Line Items]
Weighted average common shares-basic	18,750,184	18,404,856
Effect of dilutive securities
Weighted average common shares-diluted	19,191,146	18,874,591
Stock Options And Stock Purchase Plan [Member]
Effect of dilutive securities
Effect of diluted securities	277,992	308,537
Restricted Stock Units [Member]
Effect of dilutive securities
Effect of diluted securities	162,970	161,198

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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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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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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-Topic 260
-SubTopic 10
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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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-Topic 260
-SubTopic 10
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