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Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
For the three months ended December 31, 2013 $ 1,909  
For the twelve months ended December 31, 2014 6,934  
For the twelve months ended December 31, 2015 6,641  
For the twelve months ended December 31, 2016 6,418  
For the twelve months ended December 31, 2017 5,773  
Thereafter 31,652  
Total $ 59,327 $ 20,567