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Debt - Summary of Long-term Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Debt Disclosure [Abstract]      
Revolving credit facility $ 73.8 $ 46.1 $ 75.9
Other obligations 2.2 2.5 2.4
Total debt 76.0 48.6 78.3
Less current portion 0.8 1.2 0.8
Long-term debt $ 75.2 $ 47.4 $ 77.5