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Estimated Total Amortization Expense for Finite-Lived Intangibles for Next Five Fiscal Years (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite Lived Intangible Assets Amortization Expense [Line Items]  
2018 $ 402,005
2019 326,807
2020 315,077
2021 180,290
2022 146,499
Thereafter $ 344,484