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Commitments and Contingencies (Details Textual) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Plaintiffs
Cases
Sites
Dec. 31, 2011
Loss Contingencies [Line Items]    
Estimate Cost $ 1.5  
Commitments and Contingencies (Textual) [Abstract]    
Receivables for recoveries 0 0
Number of sites 50  
Not currently able to estimate a range of costs 5  
Number of plaintiffs involved 2,050  
Number of plaintiffs have been administratively dismissed or placed on the inactive docket 8,075  
Types of cases pending 1,125  
NL Industries Inc [Member]
    
Loss Contingencies [Line Items]    
Number of cases settled and dismissed and found not liable 100  
Period by which loss contingency claims settled and dismissed 20 years  
Estimate costs 83  
Estimate Cost $ 54.0