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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
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator        
Net income $ 13,712 $ 8,869 $ 25,997 $ 16,048
Determination of shares        
Weighted-average common shares outstanding 4,940 4,912 4,934 4,914
Dilutive effect - share-based awards 15 18 20 21
Diluted weighted-average common shares outstanding 4,955 4,930 4,954 4,935
Basic $ 2.78 $ 1.81 $ 5.27 $ 3.27
Diluted $ 2.77 $ 1.80 $ 5.25 $ 3.25