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Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Intangible Assets, Excluding the In-Process Research and Development (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 107,941
2019 98,855
2020 87,140
2021 79,478
2022 31,173
Thereafter 24,998
Finite-lived intangible assets, net $ 429,585