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Goodwill and Intangible Assets - Total Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Six months ending December 31, 2019 $ 23,222  
2020 44,550  
2021 44,550  
2022 44,550  
2023 38,362  
Thereafter 126,791  
Finite-lived intangible assets, Net Carrying Amount $ 322,025 $ 235,466