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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Unit
oz
lb
MMBTU
Dec. 31, 2013
Unit
lb
oz
MMBTU
Feb. 28, 2011
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Contractual weighted-average cost 3.24lxu_WeightedAverageCostPerMmbtuOfFutureOrForwardNaturalGasContract 3.98lxu_WeightedAverageCostPerMmbtuOfFutureOrForwardNaturalGasContract  
Estimated weighted-average market value 2.99lxu_WeightedAverageMarketValuePerMmbtuOfFutureOrForwardNaturalGasContract    
Contractual weighted-average pay rate 3.23%lxu_ContractualWeightedAveragePayRate    
Estimated market weighted-average receive rate 0.53%lxu_EstimatedMarketWeightedAverageReceiveRate    
Carbon credit fair value per unit 2.50lxu_CarbonCreditFairValuePerUnit 1.00lxu_CarbonCreditFairValuePerUnit  
Derivative future or forward contracts in pounds 1,750,000lxu_DerivativeFutureOrForwardContractInPounds 0lxu_DerivativeFutureOrForwardContractInPounds  
Derivative future or forward contracts in volume 8,279,000lxu_DerivativeFutureOrForwardContractInVolume 1,530,000lxu_DerivativeFutureOrForwardContractInVolume  
Future or forward copper contracts period May 2015    
Weighted-average cost per pound of future or forward copper contracts 2.98lxu_WeightedAverageCostPerPoundOfFutureOrForwardCopperContract    
The month future or forward natural gas contract period ends 2016-06 2014-10  
Future or forward contract in ounces 3,000lxu_DerivativeFutureOrForwardContractInOunces 0lxu_DerivativeFutureOrForwardContractInOunces  
Future or forward platinum contracts settlement period   2015-04  
Weighted-average cost per ounce of future or forward platinum contracts 1,224.26lxu_WeightedAverageCostPerOunceOfFutureOrForwardPlatinumContract    
Amount of foreign currency contract $ 819,000us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet    
Contractual exchange rate 1.27us-gaap_DerivativeForwardExchangeRate1    
Future or forward foreign exchange contracts settlement period 2015-05    
LIBOR rate     3.23%us-gaap_DerivativeFixedInterestRate
Interest rate swap declining balance beginning balance     23,800,000invest_DerivativeNotionalAmount
Interest rate swap declining balance ending balance     18,800,000lxu_InterestRateSwapDecliningBalanceMinimumAmount
Interest rate contracts fixed rate description Fixed three-month LIBOR rate of 3.23% on a declining balance    
Maturity period interest rate contracts held March 2016    
Number of carbon credits 1,112,000lxu_CarbonCreditContractualObligationNumberOfInstrumentsHeld 1,284,000lxu_CarbonCreditContractualObligationNumberOfInstrumentsHeld  
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications    31,000lxu_FairValueMeasurementWithInputsReconciliationRecurringBasisAssetTransfersInOutOfLevelOneAndLevelTwo  
Foreign Exchange Contracts [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Total contractual weighted-average exchange rate 1.27us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		    
Total estimated market weighted-average exchange rate 1.22lxu_WeightedAverageExchangeRateDuringPeriod
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		    
Copper [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of futures/forward contracts 0us-gaap_DerivativeForwardPrice
/ us-gaap_DerivativeInstrumentRiskAxis
= lxu_CopperMember		    
Platinum [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Amount of futures/forward contracts 0us-gaap_DerivativeForwardPrice
/ us-gaap_DerivativeInstrumentRiskAxis
= lxu_PlatinumMember		    
Senior Secured Notes [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Excess of estimated fair value over carrying value $ 17,000,000lxu_ExcessOfEstimatedFairValueOverCarryingValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 $ 20,000,000lxu_ExcessOfEstimatedFairValueOverCarryingValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Senior Secured Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notes lower range of ask or bid price   $ 104.5lxu_NotesLowerRangeOfAskBidPrices
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Notes higher range of ask or bid price   $ 104.9lxu_NotesHigherRangeOfAskBidPrices
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Notes based on quoted price $ 104.0us-gaap_FairValueInputsOfferedQuotes
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember