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Derivatives, Hedges, Financial Instruments and Carbon Credits - Net Gains (Losses) Included in Earnings and the Income Statement Classifications (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Total net gains (losses) included in operating results: |  |  |  |
Total net gains (losses) included in operating results | $ (200) | $ (90) | $ 2,145 | $ (276)
Cost of sales [Member] | Commodities contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Total net gains (losses) included in operating results: |  |  |  |
Total net gains (losses) included in operating results | (214) |  | 1,897 | (275)
Other income [Member] | Carbon credits [Member] |  |  |  |
Total net gains (losses) included in operating results: |  |  |  |
Total net gains (losses) included in operating results |  |  | 1,925 | 546
Other expense [Member] | Contractual obligations relating to carbon credits [Member] |  |  |  |
Total net gains (losses) included in operating results: |  |  |  |
Total net gains (losses) included in operating results |  |  | (1,634) | (546)
Interest expense [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Total net gains (losses) included in operating results: |  |  |  |
Total net gains (losses) included in operating results | $ 14 | $ (90) | $ (43) | $ (1)

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- Definition The amount of net gains and losses (realized and unrealized) recognized in earnings during the period on derivative instruments and carbon credit assets or carbon credit contractual obligations measured at fair value. + References No definition available. + Details
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Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | lxu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration