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Amortization Expense for Amortized Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Liabilities [Line Items]    
2019 (remaining three months) $ 3,918  
2020 15,129  
2021 14,633  
2022 14,631  
2023 14,631  
2024 and thereafter 152,647  
Total $ 215,589 $ 134,738