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Contingencies - Summary of Cumulative Trauma Product Liability Claims Activity (Detail) - LegalMatter | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Lawsuits |  |  |
Loss Contingency, Quantities [Roll Forward] |  |  |
Open lawsuits/Pending claims, January 1 | 1,794 | 1,988 | 2,326
New lawsuits/claims | 398 | 379 | 340
Settled and dismissed lawsuits/claims | (772) | (573) | (678)
Open lawsuits/Pending claims, December 31 | 1,420 | 1,794 | 1,988
Pending claims |  |  |
Loss Contingency, Quantities [Roll Forward] |  |  |
Open lawsuits/Pending claims, January 1 | 3,023 | 3,779 | 5,539
New lawsuits/claims | 455 | 843 | 465
Settled and dismissed lawsuits/claims | (1,236) | (1,599) | (2,225)
Open lawsuits/Pending claims, December 31 | 2,242 | 3,023 | 3,779

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