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Estimated Future Amortization Expense for Acquired Intangible Assets Subject to Amortization (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Schedule Of Actual And Estimated Amortization Expense [Line Items]  
2014 (after June 30,) $ 12.3
2015 24.2
2016 23.5
2017 19.9
2018 15.1
Thereafter $ 114.1