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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 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net income $ 6,467 $ 6,476 $ 5,912 $ 5,176 $ 7,367 $ 6,507 $ 5,408 $ 4,083 $ 24,031 $ 23,365 $ 14,802
Denominator:                      
Weighted average shares outstanding for basic earnings per share                 11,824 12,849 12,701
Effect of dilutive securities                 261 225 250
Weighted average shares adjusted for dilutive securities                 12,085 13,074 12,951
Basic $ 0.57 $ 0.57 $ 0.50 $ 0.41 $ 0.57 $ 0.51 $ 0.42 $ 0.32 $ 2.03 $ 1.82 $ 1.17
Diluted $ 0.55 $ 0.56 $ 0.49 $ 0.40 $ 0.56 $ 0.50 $ 0.41 $ 0.31 $ 1.99 $ 1.79 $ 1.14