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Commitments and Contingencies - Additional Information (Detail) (USD $) | 1 Months Ended |  | 9 Months Ended |  | 9 Months Ended
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Apr. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2014 Climate Control Business [Member] | Sep. 30, 2014 Hallowell Facility [Member] Subsidiary | Sep. 30, 2014 El Dorado Facility [Member] | Sep. 30, 2014 El Dorado Facility [Member] Ammonia Plant [Member] | Sep. 30, 2014 El Dorado Facility [Member] Nitric Acid Plant [Member] | Sep. 30, 2014 El Dorado Facility [Member] Minimum [Member] Ammonia Plant [Member] | Sep. 30, 2014 El Dorado Facility [Member] Minimum [Member] Nitric Acid Plant [Member] | Sep. 30, 2014 El Dorado Facility [Member] Maximum [Member] Ammonia Plant [Member] | Sep. 30, 2014 El Dorado Facility [Member] Maximum [Member] Nitric Acid Plant [Member] | Sep. 30, 2014 Pryor Chemical Company [Member] | Sep. 30, 2014 Amended Ammonium Nitrate Supply Agreement [Member] Orica International [Member] | Sep. 30, 2014 Amended Ammonium Nitrate Supply Agreement [Member] Orica International [Member] Minimum [Member] T
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated range of project costs to construct plant |  |  |  |  |  |  |  | $ 275,000,000 | $ 125,000,000 | $ 300,000,000 | $ 130,000,000 |  |  |
Project costs capitalized |  |  |  |  |  | 99,000,000 | 85,000,000 |  |  |  |  |  |  |
Current purchase agreement quantity with Orica International |  |  |  |  |  |  |  |  |  |  |  |  |  | 240,000
Ammonium nitrate supply agreement maturity date |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 09, 2015 |
Notice of termination |  |  |  |  |  |  |  |  |  |  |  |  | Required notice of termination of one year |
Accrued liabilities for environmental matters |  | 456,000 |  |  |  |  |  |  |  |  |  |  |  |
Operating agreement maturity date |  |  |  |  | Dec. 31, 2053 |  |  |  |  |  |  |  |  |
Penalty related to discharge water permit |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Settlement relating to ammonia release |  |  |  |  |  |  |  |  |  |  |  | 37,500 |  |
Number of subsidiaries under Chemical Business that sold their operating assets |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Insurance coverage of general liability risks | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Product liability deductible per claim | 250,000 |  | 250,000 |  |  |  |  |  |  |  |  |  |  |
Accrued general liability insurance claims |  | $ 526,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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