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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator        
Net income $ 11,887 $ 10,708 $ 37,884 $ 26,755
Determination of shares        
Weighted-average common shares outstanding 4,937 4,900 4,935 4,909
Dilutive effect - share-based awards 99 75 48 41
Diluted weighted-average common shares outstanding 5,036 4,975 4,983 4,950
Basic $ 2.41 $ 2.19 $ 7.68 $ 5.45
Diluted $ 2.36 $ 2.15 $ 7.60 $ 5.40