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Commitments and Contingencies - Range of Environmental Liability and Number of Active Sites for Environmental Matters (Detail) (Environmental Related Matters [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2013 site | Dec. 31, 2012 site
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Environmental Related Matters [Member] |  |
Environmental Matters Range Of Estimated Liability And Active Sites Numbers [Line Items] |  |
Low-end range | $ 73.3 | $ 76.9
High end range | $ 168.0 | $ 167.1
Number of active environmental investigation and remediation sites | 60 | 58

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