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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 |  |

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