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Computation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator
Net income	$ 29,803	$ 23,303	$ 26,581
Determination of shares (in thousands)
Weighted-average common shares outstanding	4,923	5,031	5,032
Dilutive effect - share-based awards	61	56	75
Diluted weighted-average common shares outstanding	4,984	5,087	5,107
Earnings per common share
Basic	$ 6.05	$ 4.63	$ 5.28
Diluted	$ 5.98	$ 4.58	$ 5.21

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