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Commitments and Contingencies - Additional Information (Detail) MMBTU in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) MMBTU Settlement $ / MMBTU | Dec. 31, 2018 USD ($) | Mar. 31, 2016 USD ($)
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 |  |
Litigation liability paid | $ 18,500,000 |  |  |
Estimated litigation liability |  | $ 0 | $ 18,450,000 |
Global Industrial Inc [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Estimated litigation liability |  |  |  | $ 0
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 |  | 4.6 |  |
Weighted average cost of natural gas per unit | $ / MMBTU |  | 2.50 |  |
Weighted average purchase price of natural gas |  | $ 11,500,000 |  |
Weighted average natural gas market value per unit | $ / MMBTU |  | 2.12 |  |
Weighted average natural gas market value |  | $ 9,700,000 |  |

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