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Components of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net income	$ 27,404	$ 18,587	$ 15,242
Denominator:
Weighted average shares outstanding—basic	29,234,000	29,811,000	29,450,000
Dilutive effect of stock options and grants	638,000	599,000	543,000
Weighted average shares outstanding—diluted	29,872,000	30,410,000	29,993,000

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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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