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Commitments and Contingencies - Purchase Obligations - (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Purchase Obligation Fiscal Year Maturity [Abstract]  
Purchase obligations, 2017 $ 3.3
Purchase obligations, 2018 2.3
Purchase obligations, 2019 1.9
Purchase obligations, 2020 0.8
Purchase obligations, 2021 0.5
Purchase obligations, Total $ 8.8