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Components of Basic and Diluted Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 18,587	$ 15,242	$ 13,601
Denominator:
Weighted average shares outstanding—basic	29,811	29,450	29,030
Dilutive effect of stock options and grants	599	543	626
Weighted average shares outstanding—diluted	30,410	29,993	29,656

X

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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.

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