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Balance Sheet Components - Estimated Future Amortization Expense Related to Intangibles (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]        
2018 $ 196,469      
2019 191,298      
2020 184,602      
2021 176,740      
2022 172,547      
Thereafter 1,463,316      
Intangible assets, net $ 2,384,972 $ 719,231 $ 224,565 $ 147,527