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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
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Mar. 31, 2015 | Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gain (losses) included in earnings | $ (2,102)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings | $ 2,487 lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings
Cost of Sales [Member] | Commodities Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gain (losses) included in earnings | (1,978)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 2,216 lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Cost of Sales [Member] | Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gain (losses) included in earnings | (93)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |
Other Income [Member] | Carbon Credits [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gain (losses) included in earnings | (30)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_CarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | 1,925 lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_CarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember
Other Expense [Member] | Contractual Obligations Relating to Carbon Credits [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gain (losses) included in earnings | 30 lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_ContractualObligationsRelatingToCarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | (1,634)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_ContractualObligationsRelatingToCarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember
Interest Expense [Member] | Interest Rate Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gain (losses) included in earnings | $ (31)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember | $ (20)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember

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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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