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Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail)
$ in Thousands
Sep. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 (remaining) $ 10,767
2018 43,273
2019 40,160
2020 28,115
2021 20,302
2022 17,621
Thereafter $ 157,010