Commitments and Contingencies - Additional Information (Detail)	1 Months Ended		3 Months Ended	6 Months Ended
	May 31, 2018 USD ($) Installment	Jan. 31, 2014 USD ($)	Jun. 30, 2018 USD ($) Cases Installment site	Jun. 30, 2018 USD ($) Cases Installment site Plaintiff	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Commitments and Contingent Liabilities [Line Items]
Litigation settlement			$ 60,000,000	$ 60,000,000
Litigation settlement net present value			17,000,000	17,000,000
Accrued insurance recoveries			15,000,000	15,000,000		$ 145,000
Accrual for reasonably estimable environmental remediation and related matters					$ 115,461,000	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			$ 115,000,000	$ 115,000,000
Number of sites associated with remediation and related costs | site			38	38
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			145,000,000	$ 145,000,000
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, and we do not believe any individual defendant would be 100% responsible for the cost of any abatement.
Percentage of defendants responsible for cost of abatement				100.00%
Litigation settlement	$ 65,000,000		62,000,000	$ 62,000,000
Litigation settlement charge upon trial court's approval	45,000,000		45,000,000	45,000,000
Remaining litigation settlement charge	$ 20,000,000		$ 20,000,000	$ 20,000,000
Number of annual installments | Installment	5		5	5
Litigation settlement installments payment beginning term from approval	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
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
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			110	110
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				583