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Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
Remainder of 2019 $ 3,994  
2020 4,444  
2021 4,096  
2022 3,472  
2023 3,320  
Thereafter 12,491  
Net Value $ 31,817 $ 33,183