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Earnings and Dividends per Share - Number of Shares Outstanding for Calculation of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Basic net income and earnings per share, Numerator (Income) $ 2,104 $ 4,493 $ 2,302 $ 7,514
Common stock equivalents arising from stock options and employee stock purchase plan, Numerator (Income) 0 0 0 0
Diluted earnings (loss) and earnings (loss) per share, Numerator (Income) $ 2,104 $ 4,493 $ 2,302 $ 7,514
Basic net income and earnings per share, Denominator (Shares) 26,283,529 25,643,508 26,277,456 25,625,033
Common stock equivalents arising from stock options and employee stock purchase plan, Denominator (Shares) 343,000 464,000 367,000 487,000
Diluted earnings and earnings per share, Denominator (Shares) 26,627,051 26,107,648 26,643,857 26,111,683
Basic net income and earnings per share, Per Share Amount $ 0.08 $ 0.18 $ 0.09 $ 0.29
Common stock equivalents arising from stock options and employee stock purchase plan, Per Share Amount   (0.01)    
Diluted earnings and earnings per share, Per Share Amount $ 0.08 $ 0.17 $ 0.09 $ 0.29