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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net income $ 8,108 $ 8,644
Denominator:    
Weighted average shares outstanding for basic earnings per share 11,712 11,618
Effect of dilutive securities 364 412
Weighted average shares adjusted for dilutive securities 12,076 12,030
Basic $ 0.69 $ 0.74
Diluted $ 0.67 $ 0.72