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Commitments and Contingencies - Other Litigation - Additional Information (Detail) - Product Liability And Occupational Exposure Litigation Claims - NL	3 Months Ended
	Mar. 31, 2018 Cases Plaintiff
Commitments And Contingent Liabilities [Line Items]
Cases pending | Cases	106
Pending Claims
Commitments And Contingent Liabilities [Line Items]
Number of plaintiffs involved	579
Administratively Dismissed Claims
Commitments And Contingent Liabilities [Line Items]
Number of plaintiffs involved	8,676

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Number of plaintiffs that have filed claims pertaining to a loss contingency.

+ References

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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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Commitments and contingent liabilities.

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