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Goodwill and Other Intangible Assets - Estimated Amortization Expenses (Detail)
$ in Thousands
Jun. 30, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remaining 2015 $ 23,464
2016 39,154
2017 35,942
2018 32,966
2019 31,937
2020 $ 30,017