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Components of Basic and Diluted Earnings Per Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Numerator:    
Net income $ 520 $ 3,906
Denominator:    
Weighted average shares outstanding-basic 29,288 28,977
Dilutive effect of stock options and grants 660 602
Weighted average shares outstanding-diluted 29,948 29,579