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Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Finite Lived Intangible Assets Net [Abstract]    
For the nine months ended December 31, 2019 $ 3,307  
For the twelve months ended December 31, 2020 4,358  
For the twelve months ended December 31, 2021 2,447  
For the twelve months ended December 31, 2022 2,333  
For the twelve months ended December 31, 2023 2,307  
Thereafter 9,948  
Total $ 24,700 $ 30,653