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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Deferred finance costs $ (0.9) $ (1.6)
Long-term debt 207.6 218.4
Less current portion (21.4) (15.8)
Long-term debt, net of current portion 186.2 202.6
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 82.5 99.0
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 126.0 $ 121.0