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Commitments and Contingencies - Range of Environmental Liability and Number of Active Sites for Environmental Matters (Detail) - Environmental Related Matters [Member] $ in Millions | Dec. 31, 2017 USD ($) site | Dec. 31, 2016 USD ($) site
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Environmental Matters Range Of Estimated Liability And Active Sites Numbers [Line Items] |  |
Number of active environmental investigation and remediation sites | site | 36 | 39
Maximum [Member] |  |
Environmental Matters Range Of Estimated Liability And Active Sites Numbers [Line Items] |  |
Possible High End Range of Environmental Liability | $ | $ 126.3 | $ 127.6

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