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Earnings Per Share (Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:                
Net income $ 34,453 $ 21,935 $ 18,477 $ 15,902 $ 21,383 $ 20,750 $ 74,865 $ 58,035
Denominator:                
Weighted average shares of common stock outstanding 11,766     11,731     11,772 11,823
Effect of dilutive common stock equivalents 91     334     68 351
Weighted average shares of common stock outstanding 11,857     12,065     11,840 12,174
Basic earnings per share                
Earnings per share - basic $ 2.93     $ 1.36     $ 6.36 $ 4.91
Diluted earnings per share                
Earnings per share - diluted $ 2.91     $ 1.32     $ 6.32 $ 4.77