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Goodwill and Intangible Assets - Amortization Expenses for Existing Intangible Assets for the Next Five Years (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense for existing other intangible assets, 2019 $ 66,532
Amortization expense for existing other intangible assets, 2020 59,969
Amortization expense for existing other intangible assets, 2021 53,771
Amortization expense for existing other intangible assets, 2022 46,249
Amortization expense for existing other intangible assets, 2023 $ 40,448