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Options Outstanding (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise Prices, Minimum $ 1.22  
Exercise Prices, Maximum $ 2.64  
Options Outstanding and Exercisable, Number of Shares 16,500  
Options Outstanding and Exercisable, Weighted Avg. Remaining Contractual Life (years) 6 months 26 days 1 year 3 months 15 days
Options Outstanding and Exercisable Weighted Avg. Exercise Price $ 2.51 $ 2.09
$ 1.22 to $ 1.22
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise Prices, Minimum $ 1.22  
Exercise Prices, Maximum $ 1.22  
Options Outstanding and Exercisable, Number of Shares 1,500  
Options Outstanding and Exercisable, Weighted Avg. Remaining Contractual Life (years) 2 months 5 days  
Options Outstanding and Exercisable Weighted Avg. Exercise Price $ 1.22  
$ 1.22 to $ 2.64
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise Prices, Minimum $ 1.22  
Exercise Prices, Maximum $ 2.64  
Options Outstanding and Exercisable, Number of Shares 15,000  
Options Outstanding and Exercisable, Weighted Avg. Remaining Contractual Life (years) 7 months 10 days  
Options Outstanding and Exercisable Weighted Avg. Exercise Price $ 2.64