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Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 (remaining) $ 51,638
2020 55,751
2021 47,958
2022 45,480
2023 45,121
2024 44,204
Thereafter $ 273,039