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Intangible Assets - Total Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Nine months ending December 31, 2019 $ 25,921  
2020 32,692  
2021 32,692  
2022 32,692  
2023 26,511  
Thereafter 76,034  
Finite-lived intangible assets, Net Carrying Amount $ 226,542 $ 235,466