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Goodwill and Intangible Assets - Summary of Amortization Expense to be Incurred in 2018 Through 2022 on Intangible Assets (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2018 $ 8,066
2019 6,944
2020 6,941
2021 6,941
2022 $ 6,887