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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

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