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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
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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 | 3.09 lxu_WeightedAverageCostPerMmbtuOfFutureOrForwardNaturalGasContract | 3.24 lxu_WeightedAverageCostPerMmbtuOfFutureOrForwardNaturalGasContract |  |  |  |  |  |  |  |
Estimated weighted-average market value | 2.73 lxu_WeightedAverageMarketValuePerMmbtuOfFutureOrForwardNaturalGasContract |  |  |  |  |  |  |  |  |
Total contractual weighted-average exchange rate |  |  |  |  |  |  |  |  |  | 1.27 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
Total estimated market weighted-average exchange rate |  |  |  |  |  |  |  |  |  | 1.07 lxu_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 | 2.50 lxu_CarbonCreditFairValuePerUnit | 2.50 lxu_CarbonCreditFairValuePerUnit |  |  |  |  |  |  |  |
Derivative future or forward contracts in pounds | 1,950,000 lxu_DerivativeFutureOrForwardContractInPounds | 1,750,000 lxu_DerivativeFutureOrForwardContractInPounds |  |  |  |  |  |  |  |
Derivative future or forward contracts in volume | 6,406,000 lxu_DerivativeFutureOrForwardContractInVolume | 8,279,000 lxu_DerivativeFutureOrForwardContractInVolume |  |  |  |  |  |  |  |
Future or forward copper contracts period | 2015-12 | 2015-05 |  |  |  |  |  |  |  |
Weighted-average cost per pound of future or forward copper contracts | 2.96 lxu_WeightedAverageCostPerPoundOfFutureOrForwardCopperContract | 2.98 lxu_WeightedAverageCostPerPoundOfFutureOrForwardCopperContract |  |  |  |  |  |  |  |
The month future or forward natural gas contract period ends | 2016-06 | 2016-06 |  |  |  |  |  |  |  |
Future or forward contract in ounces | 3,000 lxu_DerivativeFutureOrForwardContractInOunces | 3,000 lxu_DerivativeFutureOrForwardContractInOunces |  |  |  |  |  |  |  |
Future or forward platinum contracts settlement period | 2015-07 | 2015-04 |  |  |  |  |  |  |  |
Weighted-average cost per ounce of future or forward platinum contracts | 1,120.87 lxu_WeightedAverageCostPerOunceOfFutureOrForwardPlatinumContract | 1,224.26 lxu_WeightedAverageCostPerOunceOfFutureOrForwardPlatinumContract |  |  |  |  |  |  |  |
Amount of foreign currency contract |  |  | € 648,000 us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet | € 819,000 us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet |  |  |  |  |  |
Contractual exchange rate | 1.27 us-gaap_DerivativeForwardExchangeRate1 | 1.27 us-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 |  |  |  |  | 23,800,000 invest_DerivativeNotionalAmount |  |  |  |  |
Interest rate swap declining balance ending balance |  |  |  |  | 18,800,000 lxu_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 | 1,086,000 lxu_CarbonCreditContractualObligationNumberOfInstrumentsHeld | 1,112,000 lxu_CarbonCreditContractualObligationNumberOfInstrumentsHeld |  |  |  |  |  |  |  |
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications | 0 lxu_FairValueMeasurementWithInputsReconciliationRecurringBasisAssetTransfersInOutOfLevelOneAndLevelTwo |  |  |  |  |  |  |  |  |
Excess of estimated fair value over carrying value |  |  |  |  |  | $ 17,000,000 lxu_ExcessOfEstimatedFairValueOverCarryingValue / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | $ 17,000,000 lxu_ExcessOfEstimatedFairValueOverCarryingValue / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |
Notes based on quoted price |  |  |  |  |  |  |  | $ 104.0 us-gaap_FairValueInputsOfferedQuotes / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | $ 104.0 us-gaap_FairValueInputsOfferedQuotes / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The number of carbon credit units held by the entity subject to contractual obligations. + References No definition available. + Details
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- Definition The fair value per carbon credit unit as of the balance sheet date. + References No definition available. + Details
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- Definition Contractual weighted average pay rate related to the entity's interest rate contracts as of the balance sheet date. + References No definition available. + Details
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- Definition The quantity of derivative future or forward contract(s) measured in ounces. + References No definition available. + Details
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- Definition The derivative future or forward contract(s) measured in pounds as of the period end. + References No definition available. + Details
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- Definition The volume of derivative future or forward contract(s) as of the period end. + References No definition available. + Details
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- Definition Derivative future or forward foreign exchange contract period. + References No definition available. + Details
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- Definition The period derivative future or forward platinum contract(s) settle. + References No definition available. + Details
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- Definition Estimated market weighted average receive rate related to the entity's interest rate contracts as of the balance sheet date. + References No definition available. + Details
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- Definition Excess Of Estimated Fair Value Over Carrying Value + References No definition available. + Details
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- Definition Fair value measurement with inputs reconciliation recurring basis asset transfers in out of level one and level two. + References No definition available. + Details
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- Definition The period derivative future or forward copper contract(s) settle. + References No definition available. + Details
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- Definition The description of the fixed interest rate for a interest rate contract held as of the period end. + References No definition available. + Details
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- Definition The minimum amount of a interest rate swap declining balance as of the period end. + References No definition available. + Details
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- Definition The maturity date of a interest rate contract held as of the period end. + References No definition available. + Details
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- Definition The period derivative future or forward natural gas contract(s) settle. + References No definition available. + Details
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- Definition The weighted average cost per MMbtu of future or forward natural gas contract as of the period end. + References No definition available. + Details
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- Definition Weighted average cost per ounce of future or forward platinum contract. + References No definition available. + Details
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- Definition The weighted average cost per pound of future or forward copper contract(s) as of the period end. + References No definition available. + Details
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- Definition Weighted Average Exchange Rate During Period + References No definition available. + Details
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- Definition The weighted average market value per MMbtu of future or forward natural gas contracts as of the period end. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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- Details
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- Definition Price at which a dealer is willing to buy an instrument, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(b),(c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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