Commitments and Contingencies - Additional Information (Detail)	1 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) Cases Installment site	May 31, 2018 USD ($) Installment	Jan. 31, 2014 USD ($)	Jun. 30, 2018 USD ($) Installment	Sep. 30, 2018 USD ($) Cases Installment site Plaintiff	Dec. 31, 2017 USD ($)
Commitments and Contingent Liabilities [Line Items]
Court approved abatement fund amount for defendant appeal	$ 409,000,000
Litigation settlement	60,000,000				$ 60,000,000
Litigation settlement net present value	17,000,000				17,000,000
Accrued insurance recoveries	15,427,000				15,427,000	$ 145,000
Accrual for reasonably estimable environmental remediation and related matters	111,482,000				111,482,000	111,909,000
Environmental Remediation Sites NL Named As PRP Or Defendant
Commitments and Contingent Liabilities [Line Items]
Accrual for reasonably estimable environmental remediation and related matters	$ 111,000,000				$ 111,000,000
Number of sites associated with remediation and related costs | site	37				37
Number of sites currently not able to reasonably estimate a range of costs | site	5				5
Environmental Remediation Litigation
Commitments and Contingent Liabilities [Line Items]
Recoveries receivable	$ 15,000,000				$ 15,000,000	$ 0
Maximum
Commitments and Contingent Liabilities [Line Items]
Proposed abatement fund amount by defendant					409,000,000
Maximum | Environmental Remediation Sites NL Named As PRP Or Defendant
Commitments and Contingent Liabilities [Line Items]
Upper end range, estimate costs for remediation and related matters	130,000,000				$ 130,000,000
Lead Pigment Litigation
Commitments and Contingent Liabilities [Line Items]
Number of cases settled and dismissed and found not liable | Cases					100
Period by which loss contingency claims settled and dismissed					20 years
Description of defendants					 We and the other two defendants are jointly and severally liable for the abatement, we do not believe any individual defendant would be 100% responsible for the cost of any abatement, and the allocation of the recalculated amount of the abatement fund ($409 million) among the three defendants has not yet been determined.
Percentage of defendants responsible for cost of abatement					100.00%
Litigation settlement		$ 65,000,000		$ 62,000,000
Litigation settlement charge upon approval of settlement terms	45,000,000	45,000,000		45,000,000	$ 45,000,000
Remaining litigation settlement charge	$ 20,000,000	$ 20,000,000		$ 20,000,000	$ 20,000,000
Number of annual installments | Installment	5	5		5	5
Litigation settlement installments payment beginning term from approval		4 years		4 years	4 years
Remaining litigation settlement charge due in first installment		$ 6,000,000
Remaining litigation settlement charge due in second installment		5,000,000
Remaining litigation settlement charge due in third installment		3,000,000
Remaining litigation settlement charge due in fourth installment		3,000,000
Remaining litigation settlement charge due in fifth installment		$ 3,000,000
Discounted rate for estimated present value of remaining litigation amount		3.00%
Litigation settlement net present value	$ 17,000,000	$ 17,000,000		$ 17,000,000	$ 17,000,000
Accrued insurance recoveries	$ 15,000,000				15,000,000
Litigation settlement, current					80,000,000
California Lead Paint Litigation
Commitments and Contingent Liabilities [Line Items]
Amount awarded to the plaintiff			$ 1,150,000,000
Minimum required period of abatement funds unspent to return to defendants			4 years
Proposed abatement fund amount by plaintiff					$ 730,000,000
Percentage of assumed homeowners participation					100.00%
Percentage of actual likely homeowners participation rates					100.00%
Product Liability And Occupational Exposure Litigation Claims
Commitments and Contingent Liabilities [Line Items]
Number of cases pending | Cases	109				109
Product Liability And Occupational Exposure Litigation Claims | Administratively Dismissed Claims
Commitments and Contingent Liabilities [Line Items]
Number of plaintiffs involved | Plaintiff					8,676
Product Liability And Occupational Exposure Litigation Claims | Pending Claims
Commitments and Contingent Liabilities [Line Items]
Number of plaintiffs involved | Plaintiff					582