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Commitments and Contingencies - Additional Information (Detail)
MMBTU in Millions
 1 Months Ended 12 Months Ended
May 01, 2015
USD ($)
Jan. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
MMBTU
Settlement
$ / MMBTU
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2012
USD ($)
Commitments And Contingencies [Line Items]              
Expenses incurred in operating lease agreements       $ 9,813,000 $ 9,933,000 $ 9,845,000  
Natural gas purchase commitments | MMBTU       1.3      
Month purchase commitment period ends natural gas       2018-03      
Natural gas purchase commitments weighted average cost, per unit | $ / MMBTU       2.42      
Natural gas purchase commitments weighted average cost, amount       $ 3,000,000      
Natural gas purchase commitments weighted average market value per unit | $ / MMBTU       2.58      
Natural gas purchase commitments weighted average market value, amount       $ 3,200,000      
Outstanding letters of credit       3,400,000      
Customer advances and deposits       1,334,000 $ 2,506,000    
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       183,000      
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            
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        
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 expiry date       2019-05      
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]              
Initial terms of agreement expiry date       2019-05      
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.