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Earnings Per Share (Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Numerator:    
Net income $ 18,477 $ 20,750
Denominator:    
Weighted average shares of common stock outstanding 11,772 11,880
Effect of dilutive common stock equivalents 52 360
Weighted average shares of common stock outstanding 11,824 12,240
Basic earnings per share    
Earnings per share - basic $ 1.57 $ 1.75
Diluted earnings per share    
Earnings per share - diluted $ 1.56 $ 1.70