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Calculations of Basic and Diluted Income (Loss) Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share Disclosure [Line Items]        
Net income (loss) - basic and diluted $ 1,093 $ 3,890 $ (107) $ 5,793
Weighted-average shares outstanding - basic 12,707 12,546 12,758 12,482
Effect of dilutive securities:        
Stock options 339 254   298
Weighted-average shares outstanding - diluted 13,046 12,800 12,758 12,780
Basic income (loss) per common share $ 0.09 $ 0.31 $ (0.01) $ 0.46
Diluted income (loss) per common share $ 0.08 $ 0.30 $ (0.01) $ 0.45