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Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
2021 Notes
Level 2
Jul. 31, 2014
2013 Facility
Debt Instrument [Line Items]    
Line of credit facility outstanding   $ 30.0
Line of credit facility maximum borrowing capacity   175.0
Line of credit facility interest rate   1.98%
Fair value of the notes $ 358.8