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Share-Based Payment Arrangements (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 900,000      
Share-Based Compensation, Arrangement By Share-Pased Payment Award, Awards Expiration Term 5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) 250,821 392,350 259,189 404,387
Share-based Compensation $ 27 $ 46    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 100 100    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 18      
Four Abandoned Plans [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) 113,293      
Options And Stock Appreciation Rights [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 531,066      
Restricted Stock Awards Available For Grants [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 225,000