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Commitments and Contingencies - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 9 Months Ended
Apr. 30, 2013
Sep. 30, 2014
Sep. 30, 2014
Climate Control Business [Member]
Sep. 30, 2014
Hallowell Facility [Member]
Subsidiary
Sep. 30, 2014
El Dorado Facility [Member]
Sep. 30, 2014
El Dorado Facility [Member]
Ammonia Plant [Member]
Sep. 30, 2014
El Dorado Facility [Member]
Nitric Acid Plant [Member]
Sep. 30, 2014
El Dorado Facility [Member]
Minimum [Member]
Ammonia Plant [Member]
Sep. 30, 2014
El Dorado Facility [Member]
Minimum [Member]
Nitric Acid Plant [Member]
Sep. 30, 2014
El Dorado Facility [Member]
Maximum [Member]
Ammonia Plant [Member]
Sep. 30, 2014
El Dorado Facility [Member]
Maximum [Member]
Nitric Acid Plant [Member]
Sep. 30, 2014
Pryor Chemical Company [Member]
Sep. 30, 2014
Amended Ammonium Nitrate Supply Agreement [Member]
Orica International [Member]
Sep. 30, 2014
Amended Ammonium Nitrate Supply Agreement [Member]
Orica International [Member]
Minimum [Member]
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Commitments And Contingencies [Line Items]                            
Estimated range of project costs to construct plant               $ 275,000,000 $ 125,000,000 $ 300,000,000 $ 130,000,000      
Project costs capitalized           99,000,000 85,000,000              
Current purchase agreement quantity with Orica International                           240,000
Ammonium nitrate supply agreement maturity date                         Apr. 09, 2015  
Notice of termination                         Required notice of termination of one year  
Accrued liabilities for environmental matters   456,000                        
Operating agreement maturity date         Dec. 31, 2053                  
Penalty related to discharge water permit   100,000                        
Settlement relating to ammonia release                       37,500    
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   $ 526,000