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Contingencies - Summary of Cumulative Trauma Product Liability Claims Activity (Detail) - LegalMatter	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Lawsuits
Loss Contingency, Quantities [Roll Forward]
Open lawsuits/Pending claims, January 1	1,420	1,794	1,988
New lawsuits/claims	369	398	379
Settled and dismissed lawsuits/claims	(308)	(772)	(573)
Open lawsuits/Pending claims, December 31	1,481	1,420	1,794
Pending claims
Loss Contingency, Quantities [Roll Forward]
Open lawsuits/Pending claims, January 1	2,242	3,023	3,779
New lawsuits/claims	479	455	843
Settled and dismissed lawsuits/claims	(366)	(1,236)	(1,599)
Open lawsuits/Pending claims, December 31	2,355	2,242	3,023

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The total number of new claims filed pertaining to a loss contingency during the period.

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Number of pending claims pertaining to a loss contingency.

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