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Debt - Summary of Components of Long-Term Borrowings and Capital Lease Obligations (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Borrowings [Line Items]    
Total long-term borrowings and capital lease obligations, including current portion $ 127.5 $ 157.5
Less: Current maturities 6.1 4.2
Less: Current capital lease obligations 0.4 0.5
Total long-term borrowings and capital lease obligations, net 121.0 152.8
Capital Lease Obligations
   
Borrowings [Line Items]    
Total long-term borrowings and capital lease obligations, including current portion 1.4 1.7
Senior Secured Credit Facility | Revolving Credit Facility
   
Borrowings [Line Items]    
Total long-term borrowings and capital lease obligations, including current portion 52.5 0
Senior Secured Credit Facility | Term Loan
   
Borrowings [Line Items]    
Total long-term borrowings and capital lease obligations, including current portion 73.6 0
February 2012 Financing | Term Loan
   
Borrowings [Line Items]    
Total long-term borrowings and capital lease obligations, including current portion 0 149.1
February 2012 Financing | ABL Facility
   
Borrowings [Line Items]    
Total long-term borrowings and capital lease obligations, including current portion $ 0 $ 6.7