Commitments and Contingencies - Other Litigation - Additional Information (Detail) - Product Liability And Occupational Exposure Litigation Claims - NL	6 Months Ended
	Jun. 30, 2018 Cases Plaintiff
Commitments And Contingent Liabilities [Line Items]
Cases pending | Cases	110
Pending Claims
Commitments And Contingent Liabilities [Line Items]
Number of plaintiffs involved	583
Administratively Dismissed Claims
Commitments And Contingent Liabilities [Line Items]
Number of plaintiffs involved	8,676