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Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Estimated future intangible asset amortization expense    
2015 (excluding the nine months ended June 30, 2015) $ 3,644  
2016 14,347  
2017 13,220  
2018 6,006  
2019 5,492  
Thereafter 8,560  
Total $ 51,269 $ 47,914