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Commitments and Contingencies - Additional Information (Detail)
MMBTU in Millions
 9 Months Ended
Sep. 30, 2020
USD ($)
MMBTU
Settlement
$ / MMBTU
Mar. 31, 2016
USD ($)
Commitments And Contingencies [Line Items]    
Accrued liabilities for environmental matters $ 183,000  
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  
Accrued prejudgment and post-judgment interest 1,400,000  
Property, Plant and Equipment [Member]    
Commitments And Contingencies [Line Items]    
Accrued accounts payable 3,900,000  
Depreciation expense 500,000  
Global Industrial Inc [Member]    
Commitments And Contingencies [Line Items]    
Amount awarded for labor, service, materials and other 7,400,000  
Prejudgment interest $ 1,300,000  
Percentage of accrue post judgement interest 4.25%  
Leidos Constructors, LLC [Member] | Global Industrial Inc [Member] | Accounts Payable [Member]    
Commitments And Contingencies [Line Items]    
Claim amount not approved for payment   $ 3,500,000
Natural Gas Purchase Commitments [Member]    
Commitments And Contingencies [Line Items]    
Natural gas purchase commitments volume | MMBTU 4.3  
Weighted average cost of natural gas per unit | $ / MMBTU 2.46  
Weighted average purchase price of natural gas $ 10,600,000  
Weighted average natural gas market value per unit | $ / MMBTU 2.48  
Weighted average natural gas market value $ 10,700,000