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Commitments and Contingencies - Additional Information (Detail) MMBTU in Millions | 9 Months Ended |
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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 |

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