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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator        
Net income $ 10,481 $ 7,904 $ 14,179 $ 9,728
Determination of shares        
Weighted-average common shares outstanding 4,966 5,049 4,987 5,047
Dilutive effect - share-based awards 7 9 7 9
Diluted weighted-average common shares outstanding 4,973 5,058 4,994 5,056
Earnings per common share        
Basic $ 2.11 $ 1.57 $ 2.84 $ 1.93
Diluted $ 2.11 $ 1.56 $ 2.84 $ 1.92