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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Cases
Other Environmental Cleanup Matters
  
Commitments And Contingent Liabilities [Line Items]  
Accrual for reasonably estimable environmental remediation and related matters $ 2.0
NL
  
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
NL | Pending Claims | Product Liability And Occupational Exposure Litigation Claims
  
Commitments And Contingent Liabilities [Line Items]  
Cases pending 1,130
Number of plaintiffs involved 1,643
NL | Administratively Dismissed Claims | Product Liability And Occupational Exposure Litigation Claims
  
Commitments And Contingent Liabilities [Line Items]  
Number of plaintiffs involved 8,298
NL | Environmental Remediation Sites Nl Named As Prp Or Defendant
  
Commitments And Contingent Liabilities [Line Items]  
Accrual for reasonably estimable environmental remediation and related matters 58.0
Number of sites associated with remediation ad related costs 50
Upper end range, estimate costs for remediation and related matters 154
Number of sites for which NL not currently able to estimate costs 5
Kronos Worldwide, Inc.
  
Commitments And Contingent Liabilities [Line Items]  
Case conclusion settlement amount $ 35