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Debt and Financing Arrangements - Additional Information (Detail)
$ in Millions
Sep. 30, 2015
USD ($)
Debt
Debt Instrument [Line Items]  
Primary financing arrangements 2
Unsecured credit facility | $ $ 400.0
2010 Convertible Senior Subordinated Notes [Member]  
Debt Instrument [Line Items]  
Interest rate on Notes 4.875%