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Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term debt $ 148.0 $ 30.0
Less current portion (5.3) (5.0)
Long-term debt, net of current portion 142.7 25.0
Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Long-term debt 142.0 20.0
Promissory Note [Member]
   
Debt Instrument [Line Items]    
Long-term debt 5.0 10.0
Other Long-Term Debt [Member]
   
Debt Instrument [Line Items]    
Long-term debt $ 1.0 $ 0