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Intangible Assets - Total Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Three months ending December 31, 2018 $ 8,782  
2019 34,722  
2020 32,789  
2021 32,789  
2022 32,789  
Thereafter 102,579  
Finite-lived intangible assets, Net Carrying Amount $ 244,450 $ 274,670