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Goodwill and Other Intangible Assets - Schedule of Future Estimated Amortization of Intangibles (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2016 $ 143,979
2017 152,889
2018 149,320
2019 136,571
2020 115,430
Thereafter $ 1,167,358