Annual report pursuant to Section 13 and 15(d)

Balance Sheet Details - Amortization of Company's Intangible Assets (Detail)

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Balance Sheet Details - Amortization of Company's Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets, Amortization Expense, Fiscal Year Maturity [Abstract]      
2017 $ 57,191    
2018 56,325    
2019 55,542    
2020 38,012    
Intangibles assets, Gross $ 310,645 $ 81,861 $ 48,155