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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:      
Net income $ 8,418 $ 7,645 $ 6,944
Denominator:      
Weighted-average shares outstanding 26,853 26,128 22,445
Effect of dilutive shares 810 1,379 1,303
Weighted-average diluted shares 27,663 27,507 23,748
Basic earnings per share $ 0.31 $ 0.29 $ 0.31
Diluted earnings per share $ 0.30 $ 0.28 $ 0.29