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Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
For the year ended December 31, 2016 $ 5,389    
For the year ended December 31, 2017 4,857    
For the year ended December 31, 2018 4,857    
For the year ended December 31, 2019 3,977    
For the year ended December 31, 2020 4,252    
Thereafter 16,930    
Total $ 40,262 $ 47,690 $ 55,320