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Estimated Future Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2013 $ 5,546
2014 9,489
2015 8,688
2016 8,688
2017 8,688
2018 & thereafter 11,583
Future estimated amortization expense, total $ 52,682