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Commitments and Contingencies - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Apr. 30, 2013
Jun. 30, 2013
Apr. 30, 2013
Amended Ammonium Nitrate Supply Agreement [Member]
Jun. 30, 2013
Amended Bayer Agreement [Member]
Jun. 30, 2013
Hallowell Facility [Member]
Subsidiary
Jun. 30, 2013
Climate Control Business [Member]
Jun. 30, 2013
Insurance claims [Member]
Jun. 30, 2013
El Dorado Facility [Member]
Nitric acid plant [Member]
Jun. 30, 2013
Chemical Business [Member]
Plant
Jun. 30, 2013
Pryor Chemical [Member]
Cases
Apr. 19, 2013
Pryor Chemical [Member]
Cases
Commitments And Contingencies [Line Items]                      
Notice of termination     required notice of termination from two years to one year.                
Agreement term       7 years              
Estimated project cost to construct plant               $ 120,000,000      
Project costs capitalized               25,200,000      
Accrued liabilities for environmental matters   1,074,000                  
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                  
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    
Reforestation mitigation estimated project costs                 150,000    
Amount of civil penalty                 725,000    
Amount of civil penalty                   100,000  
Number of alleged non-compliance issues                     14
Number of alleged violation resolved through a global settlement                   3  
Number of alleged violations resolved through civil penalty payment                   11  
Number of subsidiaries under Chemical Business that sold their operating assets         2            
Insurance coverage of general liability risks 100,000,000                    
Product liability deductible per claim 250,000         250,000          
Accrued general liability insurance claims             $ 489,000