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Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
2015 $ 28,294
2016 24,384
2017 19,730
2018 15,850
2019 14,164
2020 and thereafter $ 55,602