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Calculations of Basic and Diluted Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share Disclosure [Line Items]        
Net income - basic and diluted $ 559 $ 2,063 $ 1,903 $ 1,114
Weighted-average shares outstanding - basic 12,469 12,070 12,450 12,068
Effect of dilutive securities:        
Stock options 308 416 321 427
Weighted-average shares outstanding - diluted 12,777 12,486 12,771 12,495
Basic income per common share $ 0.04 $ 0.17 $ 0.15 $ 0.09
Diluted income per common share $ 0.04 $ 0.17 $ 0.15 $ 0.09