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Estimated Future Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2014 $ 3,149
2015 12,073
2016 11,386
2017 9,688
2018 8,688
2019 2,896
Future estimated amortization expense, total $ 47,880