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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Deferred finance costs $ (0.5) $ (0.9)
Long-term debt 158.0 207.6
Less current portion (21.5) (21.4)
Long-term debt, net of current portion 136.5 186.2
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 82.5 82.5
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 76.0 $ 126.0