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Earnings and Dividends per Share - Computational Components of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share [Abstract]        
Basic net income and earnings per share, Numerator (Income) $ 3,043 $ 2,485 $ 5,251 $ 4,530
Common stock equivalents arising from stock options and employee stock purchase plan, Numerator (Income)            
Subordinated convertible promissory notes, Numerator (Income)   82   169
Net Income (Loss) Available to Common Stockholders, Diluted, Total $ 3,043 $ 2,567 $ 5,251 $ 4,699
Basic net income and earnings per share, Denominator (Shares) 17,750,512 14,615,913 17,416,118 14,571,642
Common stock equivalents arising from stock options and employee stock purchase plan, Denominator (Shares) 604,000 289,000 651,000 250,000
Subordinated convertible promissory notes, Denominator (shares)   2,306,000   2,348,000
Weighted Average Number of Shares Outstanding, Diluted, Total 18,355,496 17,211,339 18,066,539 17,169,674
Basic net income and earnings per share, Per Share Amount $ 0.17 $ 0.17 $ 0.30 $ 0.31
Common stock equivalents arising from stock options and employee stock purchase plan, Per Share Amount     $ (0.01)  
Subordinated convertible promissory notes, Per Share Amount   $ (0.02)   $ (0.04)
Diluted earnings and earnings per share, Per Share Amount $ 0.17 $ 0.15 $ 0.29 $ 0.27