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Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]    
2016 $ 13,431  
2017 13,345  
2018 12,557  
2019 11,665  
2020 11,630  
Thereafter 419,167  
Net Balance $ 481,795 $ 542,248