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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
	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	14lxu_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	3,089lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_CarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember	1,233lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = lxu_CarbonCreditsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember	876lxu_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.

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