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Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 115.0 $ 148.0
Less current portion 0 (5.3)
Long-term debt, net of current portion 115.0 142.7
Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Long-term debt 115.0 142.0
Promissory Note [Member]
   
Debt Instrument [Line Items]    
Long-term debt 0 5.0
Other Long-Term Debt [Member]
   
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 1.0