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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
Mar. 31, 2018
Mar. 31, 2017
Numerator    
Net income $ 5,528 $ 1,518
Determination of shares    
Weighted-average common shares outstanding 5,046 5,118
Dilutive effect - share-based awards 18 12
Diluted weighted-average common shares outstanding 5,064 5,130
Earnings per common share    
Basic $ 1.10 $ 0.30
Diluted $ 1.09 $ 0.30