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Debt - Summary of Long-term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Revolving credit facility $ 52.2 $ 46.1
Other obligations 3.3 2.5
Total debt 55.5 48.6
Less current portion 1.0 1.2
Long-term debt $ 54.5 $ 47.4