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Commitments and Contingencies - Additional Information (Detail)
MMBTU in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
May. 01, 2015
USD ($)
Sep. 30, 2015
USD ($)
MMBTU
Settlements
$ / MMBTU
Oct. 31, 2014
Violations
Sep. 30, 2015
USD ($)
Settlements
T
Dec. 31, 2002
Subsidiary
Dec. 31, 2012
USD ($)
Commitments And Contingencies [Line Items]            
Natural gas purchase commitments | MMBTU   6.1        
Month purchase commitment period ends for natural gas   2016-12        
Natural gas purchase commitments weighted average cost, per unit | $ / MMBTU   2.96        
Natural gas purchase commitments weighted average cost, amount   $ 18,100,000        
Natural gas purchase commitments weighted average market value per unit | $ / MMBTU   2.74        
Natural gas purchase commitments weighted average market value, amount   $ 16,800,000        
Accrued liabilities for environmental matters   452,000   $ 452,000    
Penalty related to discharge water permit           $ 100,000
Percentage of payment of investigation costs agreed by Hallowell Facility       50.00%    
Insurance coverage of general liability risks   $ 100,000,000   $ 100,000,000    
Product liability deductible per claim       $ 250,000    
Confidential settlement agreement with family groups | Settlements   3   3    
Pre-litigation demand amount $ 30,000,000          
Estimated litigation liability   $ 0   $ 0    
Global Industrial Inc [Member]            
Commitments And Contingencies [Line Items]            
Claimed amount payable by Global for certain work   18,000,000        
Estimated amount paid to Global of disputed amount   6,000,000        
Adjusted estimated claim amount   12,000,000   12,000,000    
Liability amount   0   0    
Insurance Claims [Member]            
Commitments And Contingencies [Line Items]            
Accrued general liability insurance claims   560,000   560,000    
Insurance Policy One [Member] | Climate Control [Member]            
Commitments And Contingencies [Line Items]            
Product liability deductible per claim       250,000    
Insurance Policy Two [Member] | Climate Control [Member]            
Commitments And Contingencies [Line Items]            
Product liability deductible per claim       $ 500,000    
Orica International [Member] | Ammonium Nitrate Supply Agreement [Member]            
Commitments And Contingencies [Line Items]            
Ammonium nitrate supply agreement maturity date       Apr. 09, 2015    
Notice of termination       Required notice of termination of one year    
Orica International [Member] | Ammonium Nitrate Supply Agreement [Member] | Minimum [Member]            
Commitments And Contingencies [Line Items]            
Purchase agreement quantity with Orica International | T       240,000    
Cherokee Facility [Member]            
Commitments And Contingencies [Line Items]            
Accrued liabilities for environmental matters   100,000   $ 100,000    
Number of alleged violations | Violations     11      
Environmental loss contingencies civil penalty   26,000   26,000    
Hallowell Facility [Member]            
Commitments And Contingencies [Line Items]            
Number of subsidiaries under Chemical Business that sold their operating assets | Subsidiary         2  
Expansion Projects [Member] | El Dorado Facility [Member]            
Commitments And Contingencies [Line Items]            
Project costs capitalized   $ 531,000,000   531,000,000    
Expansion Projects [Member] | El Dorado Facility [Member] | Minimum [Member]            
Commitments And Contingencies [Line Items]            
Estimated range of project costs to construct plants       732,000,000    
Expansion Projects [Member] | El Dorado Facility [Member] | Maximum [Member]            
Commitments And Contingencies [Line Items]            
Estimated range of project costs to construct plants       $ 755,000,000