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Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 (remaining) $ 32,596
2019 40,511
2020 28,393
2021 20,485
2022 17,811
2023 17,427
Thereafter $ 140,413