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Commitments and Contingencies - Additional Information (Detail) MMBTU in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May. 01, 2015 USD ($) | Sep. 30, 2015 USD ($) MMBTU Settlements $ / MMBTU | Oct. 31, 2014 Violations | Sep. 30, 2015 USD ($) Settlements T | Dec. 31, 2002 Subsidiary | Dec. 31, 2012 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Natural gas purchase commitments | MMBTU |  | 6.1 |  |  |  |
Month purchase commitment period ends for natural gas |  | 2016-12 |  |  |  |
Natural gas purchase commitments weighted average cost, per unit | $ / MMBTU |  | 2.96 |  |  |  |
Natural gas purchase commitments weighted average cost, amount |  | $ 18,100,000 |  |  |  |
Natural gas purchase commitments weighted average market value per unit | $ / MMBTU |  | 2.74 |  |  |  |
Natural gas purchase commitments weighted average market value, amount |  | $ 16,800,000 |  |  |  |
Accrued liabilities for environmental matters |  | 452,000 |  | $ 452,000 |  |
Penalty related to discharge water permit |  |  |  |  |  | $ 100,000
Percentage of payment of investigation costs agreed by Hallowell Facility |  |  |  | 50.00% |  |
Insurance coverage of general liability risks |  | $ 100,000,000 |  | $ 100,000,000 |  |
Product liability deductible per claim |  |  |  | $ 250,000 |  |
Confidential settlement agreement with family groups | Settlements |  | 3 |  | 3 |  |
Pre-litigation demand amount | $ 30,000,000 |  |  |  |  |
Estimated litigation liability |  | $ 0 |  | $ 0 |  |
Global Industrial Inc [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Claimed amount payable by Global for certain work |  | 18,000,000 |  |  |  |
Estimated amount paid to Global of disputed amount |  | 6,000,000 |  |  |  |
Adjusted estimated claim amount |  | 12,000,000 |  | 12,000,000 |  |
Liability amount |  | 0 |  | 0 |  |
Insurance Claims [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Accrued general liability insurance claims |  | 560,000 |  | 560,000 |  |
Insurance Policy One [Member] | Climate Control [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Product liability deductible per claim |  |  |  | 250,000 |  |
Insurance Policy Two [Member] | Climate Control [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Product liability deductible per claim |  |  |  | $ 500,000 |  |
Orica International [Member] | Ammonium Nitrate Supply Agreement [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Ammonium nitrate supply agreement maturity date |  |  |  | Apr. 09, 2015 |  |
Notice of termination |  |  |  | Required notice of termination of one year |  |
Orica International [Member] | Ammonium Nitrate Supply Agreement [Member] | Minimum [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Purchase agreement quantity with Orica International | T |  |  |  | 240,000 |  |
Cherokee Facility [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Accrued liabilities for environmental matters |  | 100,000 |  | $ 100,000 |  |
Number of alleged violations | Violations |  |  | 11 |  |  |
Environmental loss contingencies civil penalty |  | 26,000 |  | 26,000 |  |
Hallowell Facility [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Number of subsidiaries under Chemical Business that sold their operating assets | Subsidiary |  |  |  |  | 2 |
Expansion Projects [Member] | El Dorado Facility [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Project costs capitalized |  | $ 531,000,000 |  | 531,000,000 |  |
Expansion Projects [Member] | El Dorado Facility [Member] | Minimum [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Estimated range of project costs to construct plants |  |  |  | 732,000,000 |  |
Expansion Projects [Member] | El Dorado Facility [Member] | Maximum [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Estimated range of project costs to construct plants |  |  |  | $ 755,000,000 |  |

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