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Commitments and Contingencies - Additional Information (Detail)
MMBTU in Millions
 1 Months Ended 12 Months Ended
May 01, 2015
USD ($)
Mar. 31, 2016
USD ($)
Jan. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
Violation
Dec. 31, 2016
USD ($)
MMBTU
Settlement
$ / MMBTU
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2002
Subsidiary
Dec. 31, 2012
USD ($)
Commitments And Contingencies [Line Items]                    
Expenses incurred in operating lease agreements           $ 9,933,000 $ 9,845,000 $ 7,002,000    
Working interest in natural gas properties           12.00%        
Natural gas purchase commitments | MMBTU           2.4        
Month purchase commitment period ends natural gas           2017-03        
Natural gas purchase commitments weighted average cost, per unit | $ / MMBTU           3.20        
Natural gas purchase commitments weighted average cost, amount           $ 7,800,000        
Natural gas purchase commitments weighted average market value per unit | $ / MMBTU           3.64        
Natural gas purchase commitments weighted average market value, amount           $ 8,900,000        
Outstanding letters of credit           2,800,000        
Customer advances and deposits           2,506,000 $ 2,130,000      
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           The initial term of the operating agreement is through December 2053.        
Indemnify the sureties for payments           $ 10,000,000        
Payments under employment and severance agreements           13,700,000        
Accrued liabilities for environmental matters           257,000        
Penalty related to discharge water permit                   $ 100,000
Estimated litigation liability           $ 0        
Percentage of payment of investigation costs agreed by Hallowell Facility           50.00%        
Insurance coverage of general liability and auto liability risks           $ 100,000,000        
Product liability deductible per claim           $ 250,000        
Confidential settlement agreement with family groups | Settlement           3        
Liability reserve           $ 0        
Pre-litigation demand amount $ 18,000,000                  
Cherokee Facility [Member]                    
Commitments And Contingencies [Line Items]                    
Number of alleged violations | Violation         11          
Payment of liabilities for environmental matters   $ 100,000                
Environmental loss contingencies civil penalty   $ 26,000                
Hallowell Facility [Member]                    
Commitments And Contingencies [Line Items]                    
Number of subsidiaries that sold their operating assets | Subsidiary                 2  
Gathering Agreement [Member]                    
Commitments And Contingencies [Line Items]                    
Agreement description           Contractually agreed to deliver a minimum daily quantity of natural gas to a certain gathering and pipeline system through December 2026 to ensure capacity availability on that system. This gathering agreement effectively requires a daily minimum demand charge.        
Agreement term           Dec. 31, 2026        
Global Industrial Inc [Member]                    
Commitments And Contingencies [Line Items]                    
Claimed amount payable by Global for certain work     $ 3,600,000 $ 18,000,000            
Estimated amount paid to Global of disputed amount       6,000,000            
Adjusted Estimated Claim Amount     5,000,000              
Liability amount     $ 0              
Global Industrial Inc [Member] | EL Dorado Ammonia L.L.C [Member]                    
Commitments And Contingencies [Line Items]                    
Estimated amount paid to Global of disputed amount       $ 3,500,000            
Covestro Agreement [Member]                    
Commitments And Contingencies [Line Items]                    
Operating agreement maturity period           2021-06        
UAN Supply Agreement [Member]                    
Commitments And Contingencies [Line Items]                    
Initial terms of agreement           3 years        
Notice of termination           notice of termination at least twelve months prior to the end of term        
UAN Supply Agreement [Member] | Pryor Chemical Company [Member]                    
Commitments And Contingencies [Line Items]                    
Required period for notice of termination           90 days        
UAN Supply Agreement [Member] | Coffeyville Resources Nitrogen Fertilizers L.L.C. [Member]                    
Commitments And Contingencies [Line Items]                    
Required period for notice of termination           180 days        
Ammonia Supply Agreement [Member]                    
Commitments And Contingencies [Line Items]                    
Notice of termination           notice of termination at least nine months prior to the end of term        
Supply commitment, description           the ammonia that (a) will be produced at the El Dorado Facility and (b) that is in excess of El Dorado’s needs.        
Supply commitment, period           3 years        
Demand Charge [Member] | Gathering Agreement [Member]                    
Commitments And Contingencies [Line Items]                    
Annual minimum demand charges, Year One           $ 1,800,000        
Annual minimum demand charges, Year Two           1,800,000        
Annual minimum demand charges, Year Three           1,800,000        
Annual minimum demand charges, Year Four           1,800,000        
Annual minimum demand charges, Year Five           1,800,000        
Annual minimum demand charges, Thereafter           2,100,000        
Annual minimum demand charges, Total obligation           $ 11,000,000