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Commitments and contingencies - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Surety Bond [Member] Waste Control Specialists [Member] Financial Assurance to Texas Government Agencies [Member] | Dec. 31, 2011 Surety Bond [Member] Waste Control Specialists [Member] Financial Assurance to Texas Government Agencies [Member] | Dec. 31, 2012 Additional Collateral Trust [Member] Waste Control Specialists [Member] Financial Assurance to Texas Government Agencies [Member] | Dec. 31, 2011 Additional Collateral Trust [Member] Waste Control Specialists [Member] Financial Assurance to Texas Government Agencies [Member] | Dec. 31, 2012 Additional Collateral Trust [Member] Waste Control Specialists [Member] Financial Assurance to Texas Government Agencies [Member] | Dec. 31, 2012 Customer Concentration Risk [Member] Component Products Segment [Member] Harley Davidson Inc [Member] | Dec. 31, 2011 Customer Concentration Risk [Member] Component Products Segment [Member] Harley Davidson Inc [Member] | Dec. 31, 2010 Customer Concentration Risk [Member] Component Products Segment [Member] Harley Davidson Inc [Member] | Dec. 31, 2010 Customer Concentration Risk [Member] Component Products Segment [Member] San Mateo Postal Data [Member] | Dec. 31, 2012 Customer Concentration Risk [Member] Component Products Segment [Member] Top Ten Customers [Member] | Dec. 31, 2011 Customer Concentration Risk [Member] Component Products Segment [Member] Top Ten Customers [Member] | Dec. 31, 2010 Customer Concentration Risk [Member] Component Products Segment [Member] Top Ten Customers [Member] | Dec. 31, 2012 Chemicals [Member] TiO2 Product [Member] Customer | Dec. 31, 2011 Chemicals [Member] TiO2 Product [Member] | Dec. 31, 2010 Chemicals [Member] TiO2 Product [Member] | Dec. 31, 2012 Chemicals [Member] Customer Concentration Risk [Member] Top Ten Customers [Member] | Dec. 31, 2011 Chemicals [Member] Customer Concentration Risk [Member] Top Ten Customers [Member] | Dec. 31, 2010 Chemicals [Member] Customer Concentration Risk [Member] Top Ten Customers [Member] | Dec. 31, 2012 Chemical Segment [Member] Feedstock Ore [Member] | Dec. 31, 2012 Chemical Segment [Member] Other Supply And Service Contracts [Member] | Dec. 31, 2012 Other Environmental Cleanup Matters [Member] | Dec. 31, 2012 Environmental Remediation Sites Nl Named As Prp Or Defendant [Member] site | Dec. 31, 2012 NL [Member] Cases | Dec. 31, 2011 NL [Member] Insurance claims [Member] Lead Pigment Litigation With Insurance Carriers [Member] | Dec. 31, 2009 NL [Member] Insurance claims [Member] Lead Pigment Litigation With Insurance Carriers [Member] | Dec. 31, 2012 NL [Member] Pending Claims [Member] Product Liability and Occupational Exposure Litigation Claims [Member] Plaintiff Cases | Dec. 31, 2012 NL [Member] Administratively Dismissed Claims [Member] Product Liability and Occupational Exposure Litigation Claims [Member] Plaintiff | May 31, 2010 NL [Member] Litigation Settlement [Member] | Dec. 31, 2012 NL [Member] Litigation Settlement [Member] | Dec. 31, 2011 NL [Member] Litigation Settlement [Member] | Dec. 31, 2010 NL [Member] Litigation Settlement [Member] | Dec. 31, 2012 Certain Environmental Remediation Payments Discounted To Present Value [Member] | Dec. 31, 2012 Behr Process Corporation [Member] Chemicals [Member] Customer Concentration Risk [Member] | Dec. 31, 2012 WCS [Member]
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases settled and dismissed and found not liable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |
Period by which loss contingency claims settled and dismissed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |
Additions charged to expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,300,000 |  |  |  |  |  |  |  |  | $ 5,600,000 |  |
Aggregate payments related to additions charged to expense on undiscounted basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments related to additions charged to expense on undiscounted basis, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments related to additions charged to expense on undiscounted basis, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments related to additions charged to expense on undiscounted basis, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments related to additions charged to expense on undiscounted basis, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments related to additions charged to expense on undiscounted basis, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
Aggregate payments related to additions charged to expense on discounted basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |
Accrual for other environmental cleanup matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 | 48,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of sites associated with remediation ad related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |
Upper end range, estimate costs for remediation and related matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 144,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of sites for which NL not currently able to estimate costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
Insurance recoveries reimbursed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,900,000 | 7,200,000 |  |  |  |  |  |  |  |  |
Cash paid for litigation settlement |  |  | 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,000,000 |  |  |  |  |  |
Promissory note issued for litigation settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 | 18,000,000 |  |  |  |  |
Principal amount paid on promissory note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 | 9,000,000 |  |  |  |
Litigation settlement expense |  |  | 32,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,200,000 |  |  |  |  |
Increase in estimate of litigation settlement payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |
Type of cases pending |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,125 |  |  |  |  |  |  |  |
Number of plaintiffs involved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,945 | 8,125 |  |  |  |  |  |  |
Sale of TiO2, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% | 92.00% | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale made to number of customers, TiO2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sale to top ten customers |  |  |  |  |  |  |  |  |  |  |  |  | 38.00% | 39.00% | 38.00% |  |  |  | 34.00% | 30.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales to Major Customer As a Percentage of Total Net Sales |  |  |  |  |  |  |  |  | 12.00% | 13.00% | 12.00% | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Minimum purchase commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000,000 | 122,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rent expense | 16,300,000 | 13,300,000 | 11,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surety bond purchased from third party insurance company |  |  |  | 23,400,000 | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral trust as a percent of value of bonds |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments to collateral trust |  |  |  |  |  | 2,500,000 |  | 122,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surety bond purchased of state of texas in aggregate |  |  |  | 12,350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent restricted cash | $ 20,900,000 | $ 7,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000

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