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Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Finite Lived Intangible Assets Net [Abstract]    
For the six months ended December 31, 2018 $ 2,661  
For the twelve months ended December 31, 2019 5,152  
For the twelve months ended December 31, 2020 5,310  
For the twelve months ended December 31, 2021 3,574  
For the twelve months ended December 31, 2022 3,207  
Thereafter 12,545  
Total $ 32,449 $ 37,026