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Schedule of long-term Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Jan. 31, 2015
Debt Instrument [Line Items]      
Capital leases $ 7.0 $ 4.6  
Current portion of long-term debt (2.9) (2.3)  
Long-term debt, net 377.3 354.2  
Senior Secured Notes      
Debt Instrument [Line Items]      
Principal amount outstanding 305.0 305.0 $ 305.0
Unamortized original issue discount and debt issuance costs (9.0) (10.1)  
Senior Secured Notes, net 296.0 294.9  
Term Loan      
Debt Instrument [Line Items]      
Term Loan   1.5  
Revolving Credit Facilities      
Debt Instrument [Line Items]      
Principal amount outstanding 78.2 57.0  
Unamortized original issue discount and debt issuance costs (1.0) (1.5)  
Revolving credit facilities, net $ 77.2 $ 55.5