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Commitments and Contingencies - Lead Pigment Litigation-NL and Environmental Matters and Litigation - Additional Information (Detail) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) Cases site | Dec. 31, 2014 USD ($)
Commitments And Contingent Liabilities [Line Items] |  |
Accrual for reasonably estimable environmental remediation and related matters | $ 120.4 | $ 118.5
Other Environmental Cleanup Matters |  |
Commitments And Contingent Liabilities [Line Items] |  |
Accrual for reasonably estimable environmental remediation and related matters | 8.7 |
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 | $ 112.0 |
Number of sites associated with remediation ad related costs | site | 43 |
Upper end range, estimate costs for remediation and related matters | $ 166.0 |
Number of sites for which NL not currently able to estimate range of costs | site | 5 |
Lead Pigment Litigation | NL |  |
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 |
California Lead Paint Litigation | NL |  |
Commitments And Contingent Liabilities [Line Items] |  |
Amount awarded to the plaintiff | $ 1,150.0 |

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