Quarterly report pursuant to Section 13 or 15(d)

Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail)

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Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite Lived Intangible Assets Net [Abstract]    
For the three months ended December 31, 2018 $ 1,356  
For the twelve months ended December 31, 2019 5,124  
For the twelve months ended December 31, 2020 5,255  
For the twelve months ended December 31, 2021 3,546  
For the twelve months ended December 31, 2022 3,190  
Thereafter 12,302  
Total $ 30,773 $ 37,026