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Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Fiscal Years (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Remaining 2019 $ 4,500
2020 17,900
2021 16,600
2022 14,900
2023 $ 14,500