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Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2018 (remaining) $ 10,760
2019 40,144
2020 28,125
2021 20,248
2022 17,619
2023 17,253
Thereafter $ 138,955