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Commitments and Contingencies - Additional Information (Detail)
MMBTU in Millions
 1 Months Ended 9 Months Ended
May 01, 2015
USD ($)
Jan. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2017
USD ($)
MMBTU
Settlement
$ / MMBTU
Dec. 31, 2012
USD ($)
Commitments And Contingencies [Line Items]          
Natural gas purchase commitments | MMBTU       2.4  
Month purchase commitment period ends natural gas       2017-12  
Natural gas purchase commitments weighted average cost, per unit | $ / MMBTU       2.78  
Natural gas purchase commitments weighted average cost, amount       $ 6,500,000  
Natural gas purchase commitments weighted average market value per unit | $ / MMBTU       2.75  
Natural gas purchase commitments weighted average market value, amount       $ 6,500,000  
Accrued liabilities for environmental matters       126,000  
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