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Estimated Future Amortization Costs (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Estimated Amortization Expense    
2013 (remainder) $ 19,872  
2014 79,284  
2015 73,238  
2016 68,908  
2017 68,816  
Thereafter 479,395  
Net Book Value - Finite-Lived Intangible Assets $ 789,513 $ 833,802