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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating Loss Carryforwards [Line Items] |  |  |  |
Retroactive tax relief |  | $ 500,000 lxu_RetroactiveTaxReliefForTaxProvisionsExpired |  |
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards | 2,800,000 us-gaap_OperatingLossCarryforwards |  |  |
Federal net operating loss carryforward expiration year | 2033 |  |  |
State net operating loss carryforward expiration year | 2014 |  |  |
Current period excess stock-based compensation tax deduction | 0 lxu_CurrentPeriodTaxEffectToAdditionalPaidInCapitalFromShareBasedCompensation | 0 lxu_CurrentPeriodTaxEffectToAdditionalPaidInCapitalFromShareBasedCompensation | 500,000 lxu_CurrentPeriodTaxEffectToAdditionalPaidInCapitalFromShareBasedCompensation |
Unrecognized federal and state tax benefits | 657,000 us-gaap_UnrecognizedTaxBenefits | 2,409,000 us-gaap_UnrecognizedTaxBenefits | 2,292,000 us-gaap_UnrecognizedTaxBenefits | 709,000 us-gaap_UnrecognizedTaxBenefits
Net unrecognized tax benefits | 160,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 204,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 236,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Interest and penalties associated with unrecognized tax benefits | 518,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 121,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 430,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |
Interest and penalties accrued | 67,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 585,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |
Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross tax credits | 2,100,000 us-gaap_IncomeTaxCreditsAndAdjustments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Tax carryforward period | 20 years |  |  |
Tax credit carryforward expiration year | 2034 |  |  |
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards | 33,600,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Deferred tax assets, operating loss carryforwad, excess tax benefits | 3,100,000 lxu_NolCarryforwardsExcludedFromDeferredTaxAssets / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
State NOL carryforwards | 5,900,000 lxu_OperatingLossCarryforwardsUtilizedCurrentPeriod / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 100,000 lxu_OperatingLossCarryforwardsUtilizedCurrentPeriod / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 100,000 lxu_OperatingLossCarryforwardsUtilizedCurrentPeriod / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Alternative minimum tax (ATM) remaining federal tax NOL carryforwards | 58,500,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
Portion of state NOL carryforwards, not able to be utilized before expiration | 8,100,000 lxu_OperatingLossCarryforwardsNotAbleToBeUtilizedBeforeExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 8,300,000 lxu_OperatingLossCarryforwardsNotAbleToBeUtilizedBeforeExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 6,800,000 lxu_OperatingLossCarryforwardsNotAbleToBeUtilizedBeforeExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Federal benefit | 300,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 300,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 300,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Deferred tax assets, operating loss carryforwad, excess tax benefits | 1,700,000 lxu_NolCarryforwardsExcludedFromDeferredTaxAssets / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
Federal And State Tax [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Unrecognized federal and state tax benefits | $ 1,100,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_IncomeTaxAuthorityAxis = lxu_FederalAndStateTaxMember | $ 500,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_IncomeTaxAuthorityAxis = lxu_FederalAndStateTaxMember |  |

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