Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite Lived Intangible Assets Net [Abstract]      
For the year ended December 31, 2018 $ 5,725    
For the year ended December 31, 2019 5,267    
For the year ended December 31, 2020 5,535    
For the year ended December 31, 2021 3,685    
For the year ended December 31, 2022 3,280    
Thereafter 13,534    
Total $ 37,026 $ 35,190 $ 40,262