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Schedule of Future Intangible Asset Amortization (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule Of Estimated Future Amortization Expense [Line Items]    
Net Carrying Amount $ 5,414 $ 6,532
2013 377  
2014 1,495  
2015 1,495  
2016 1,495  
2017 $ 552