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, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
For the year ended December 31, 2017 $ 4,887    
For the year ended December 31, 2018 4,835    
For the year ended December 31, 2019 3,973    
For the year ended December 31, 2020 4,304    
For the year ended December 31, 2021 2,189    
Thereafter 15,002    
Total $ 35,190 $ 40,262 $ 47,690