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Intangible Assets, Net (Estimated Future Amortization Expense of Amortizable Intangible Assets) (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Intangible Assets, Net [Abstract]  
For the year ending December 31, 2018 $ 105,991
For the year ending December 31, 2019 95,653
For the year ending December 31, 2020 85,751
For the year ending December 31, 2021 75,561
For the year ending December 31, 2022 $ 65,904