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Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Years (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Goodwill And Intangible Assets Disclosure [Abstract]  
Remaining 2015 $ 8,764
2016 11,619
2017 11,609
2018 11,140
2019 $ 10,715