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Earnings (Loss) Per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Earnings (loss) per common share:                    
Net income (loss)                 $ 4,209 $ 2,084
Weighted average basic shares                 7,990,690 7,901,225
Dilutive effect of stock options and restricted stock units                 1,481,816 357,517
Total weighted average diluted shares with assumed conversions                 9,472,506 8,258,742
Earnings loss per common share:                    
Basic $ 0.07 $ 0.11 $ 0.13 $ 0.21 $ 0.06 $ 0.06 $ 0.10 $ 0.04 $ 0.53 $ 0.26
Dilutive                 $ 0.48 $ 0.25