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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 | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gain (losses) included in earnings | $ (1,028)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings | $ (277)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings | $ (373)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 | (1,198)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (244)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 14 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 | (49)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  | (19)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 | 3,089 lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_CarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | 1,233 lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_CarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | 876 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 | (2,799)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_ContractualObligationsRelatingToCarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | (1,233)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_ContractualObligationsRelatingToCarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember | (721)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 | $ (71)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember | $ (33)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember | $ (523)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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