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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2015
USD ($)
Unit
oz
MMBTU
lb
Dec. 31, 2014
Unit
lb
oz
MMBTU
Mar. 31, 2015
EUR (€)
Dec. 31, 2014
EUR (€)
Feb. 28, 2011
USD ($)
Mar. 31, 2015
Senior Secured Notes [Member]
USD ($)
Dec. 31, 2014
Senior Secured Notes [Member]
USD ($)
Mar. 31, 2015
Senior Secured Notes [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Dec. 31, 2014
Senior Secured Notes [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Mar. 31, 2015
Foreign Exchange Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]                    
Contractual weighted-average cost 3.09lxu_WeightedAverageCostPerMmbtuOfFutureOrForwardNaturalGasContract 3.24lxu_WeightedAverageCostPerMmbtuOfFutureOrForwardNaturalGasContract                
Estimated weighted-average market value 2.73lxu_WeightedAverageMarketValuePerMmbtuOfFutureOrForwardNaturalGasContract                  
Total contractual weighted-average exchange rate                   1.27us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
Total estimated market weighted-average exchange rate                   1.07lxu_WeightedAverageExchangeRateDuringPeriod
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
Contractual weighted-average pay rate 3.23%lxu_ContractualWeightedAveragePayRate                  
Estimated market weighted-average receive rate 0.44%lxu_EstimatedMarketWeightedAverageReceiveRate                  
Carbon credit fair value per unit 2.50lxu_CarbonCreditFairValuePerUnit 2.50lxu_CarbonCreditFairValuePerUnit                
Derivative future or forward contracts in pounds 1,950,000lxu_DerivativeFutureOrForwardContractInPounds 1,750,000lxu_DerivativeFutureOrForwardContractInPounds                
Derivative future or forward contracts in volume 6,406,000lxu_DerivativeFutureOrForwardContractInVolume 8,279,000lxu_DerivativeFutureOrForwardContractInVolume                
Future or forward copper contracts period 2015-12 2015-05                
Weighted-average cost per pound of future or forward copper contracts 2.96lxu_WeightedAverageCostPerPoundOfFutureOrForwardCopperContract 2.98lxu_WeightedAverageCostPerPoundOfFutureOrForwardCopperContract                
The month future or forward natural gas contract period ends 2016-06 2016-06                
Future or forward contract in ounces 3,000lxu_DerivativeFutureOrForwardContractInOunces 3,000lxu_DerivativeFutureOrForwardContractInOunces                
Future or forward platinum contracts settlement period 2015-07 2015-04                
Weighted-average cost per ounce of future or forward platinum contracts 1,120.87lxu_WeightedAverageCostPerOunceOfFutureOrForwardPlatinumContract 1,224.26lxu_WeightedAverageCostPerOunceOfFutureOrForwardPlatinumContract                
Amount of foreign currency contract     € 648,000us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet € 819,000us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet            
Contractual exchange rate 1.27us-gaap_DerivativeForwardExchangeRate1 1.27us-gaap_DerivativeForwardExchangeRate1                
Future or forward foreign exchange contracts settlement period 2015-05 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 1,086,000lxu_CarbonCreditContractualObligationNumberOfInstrumentsHeld 1,112,000lxu_CarbonCreditContractualObligationNumberOfInstrumentsHeld                
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications 0lxu_FairValueMeasurementWithInputsReconciliationRecurringBasisAssetTransfersInOutOfLevelOneAndLevelTwo                  
Excess of estimated fair value over carrying value           $ 17,000,000lxu_ExcessOfEstimatedFairValueOverCarryingValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 $ 17,000,000lxu_ExcessOfEstimatedFairValueOverCarryingValue
/ 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		 $ 104.0us-gaap_FairValueInputsOfferedQuotes
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember