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Estimated Future Intangible Asset Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Estimated future intangible asset amortization expense    
2014 (excluding the three months ended December 31, 2013) $ 8,684  
2015 11,569  
2016 11,340  
2017 10,193  
2018 2,886  
Thereafter 10,383  
Total $ 55,055 $ 57,361