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Goodwill and Other Intangible Assets - Schedule of Future Estimated Amortization of Intangibles (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 220,506
2019 206,174
2020 186,259
2021 182,156
2022 171,177
Thereafter $ 1,259,098