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Estimated Amortization Expense for Existing Intangible Assets for Each of Five Succeeding Fiscal Years (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Remaining 2018 $ 7,000
2019 14,000
2020 13,000
2021 12,300
2022 $ 10,900