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Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term debt $ 33.0 $ 30.0
Less current portion (5.0) (5.0)
Long-term debt, net of current portion 28.0 25.0
Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Long-term debt 23.0 20.0
Promissory Note [Member]
   
Debt Instrument [Line Items]    
Long-term debt $ 10.0 $ 10.0