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Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Fiscal Years (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Remaining 2019 $ 8,300
2020 16,500
2021 15,200
2022 13,500
2023 $ 13,100