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Estimated Amortization Expense of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Expected Amortization Expense [Line Items]    
Remainder of 2014 $ 3,773  
2015 14,453  
2016 14,149  
2017 14,009  
2018 13,118  
2019 12,192  
Thereafter 474,571  
Net Balance $ 546,265 $ 24,556