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Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 43,404
2019 40,333
2020 28,262
2021 20,464
2022 17,703
Thereafter $ 157,360