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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
	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Total net gain (losses) included in earnings	$ (2,102)lxu_DerivativeInstrumentsCarbonCreditsGainLossRecognizedInEarnings	$ 2,487lxu_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	2,216lxu_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	1,925lxu_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	30lxu_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.

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