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Commitments and Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Commitments And Contingencies [Line Items]  
Accrued liabilities for environmental matters $ 587,000
Penalty related to discharge water permit 124,000
Alleged discharge water permit violation settlement amount 100,000
Capital cost in connection with construction of pipeline 3,700,000
Estimated share of the annual operating costs of pipeline, minimum 100,000
Estimated share of the annual operating costs of pipeline, maximum 150,000
Operating agreement maturity date Dec. 31, 2053
Maximum penalty amount per day under Clean Air Act 27,500
Hallowell Facility [Member]
  
Commitments And Contingencies [Line Items]  
Number of subsidiaries under Chemical Business that sold their operating assets 2
Climate Control Business [Member]
  
Commitments And Contingencies [Line Items]  
Product liability deductible per claim 250,000
Insurance claims [Member]
  
Commitments And Contingencies [Line Items]  
Accrued general liability insurance claims 647,000
El Dorado Facility [Member]
  
Commitments And Contingencies [Line Items]  
Estimated project cost to construct plant 120,000,000
El Dorado Facility [Member] | Nitric Acid Plant [Member]
  
Commitments And Contingencies [Line Items]  
Project costs capitalized 18,600,000
Chemical Business [Member]
  
Commitments And Contingencies [Line Items]  
Number of nitric acid affected plants 8
Plants compliant with Clean Air Act 2
Minimum range of estimated capital cost to meet Clean Air Act emission rates 2,000,000
Maximum range of estimated capital cost to meet Clean Air Act emission rates $ 3,000,000
Plants requiring capital investment to achieve Clean Air Act compliance 6