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Share Based Compensation - Additional Information (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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 57 $ 55 $ 150 $ 122
1998 Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares Outstanding 164,950   164,950  
2007 Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized but unissued     1,500,000  
Number of remaining shares available for grant 762,620   762,620