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Intangible Assets - Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2013 $ 56  
2014 223  
2015 223  
2016 223  
2017 223  
2018 223  
Thereafter 1,462  
Total $ 2,633 $ 2,800