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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Allowance for doubtful accounts $ 823us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 755us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Asset impairment 226us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 782us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Inventory 2,447us-gaap_DeferredTaxAssetsInventory 2,168us-gaap_DeferredTaxAssetsInventory
Deferred compensation 3,914us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 3,977us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Other accrued liabilities 7,195us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 6,429us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Hedging 1,218us-gaap_DeferredTaxAssetsHedgingTransactions 467us-gaap_DeferredTaxAssetsHedgingTransactions
Net operating loss carryforwards 13,874us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 12,046us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 3,700us-gaap_DeferredTaxAssetsOther 3,823us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 33,397us-gaap_DeferredTaxAssetsGross 30,447us-gaap_DeferredTaxAssetsGross
Less valuation allowance on deferred tax assets (292)us-gaap_DeferredTaxAssetsValuationAllowance (298)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 33,105us-gaap_DeferredTaxAssetsNet 30,149us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities    
Property, plant and equipment 92,962us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 77,126us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Prepaid and other insurance reserves 5,452lxu_DeferredTaxLiabilitiesPrepaidAndOtherInsuranceReserves 5,182lxu_DeferredTaxLiabilitiesPrepaidAndOtherInsuranceReserves
Investment in unconsolidated affiliate 64us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates 239us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Other 551us-gaap_DeferredTaxLiabilitiesOther 687us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 99,029us-gaap_DeferredTaxLiabilities 83,234us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities (65,924)us-gaap_DeferredTaxAssetsLiabilitiesNet (53,085)us-gaap_DeferredTaxAssetsLiabilitiesNet
Consolidated balance sheet classification:    
Net current deferred tax assets 17,204us-gaap_DeferredTaxAssetsNetCurrent 13,613us-gaap_DeferredTaxAssetsNetCurrent
Net noncurrent deferred tax liabilities (83,128)us-gaap_DeferredTaxLiabilitiesNoncurrent (66,698)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax liabilities (65,924)us-gaap_DeferredTaxAssetsLiabilitiesNet (53,085)us-gaap_DeferredTaxAssetsLiabilitiesNet
Net deferred tax liabilities by tax jurisdiction:    
Federal (60,696)lxu_DeferredTaxAssetsLiabilitiesNetFederal (48,503)lxu_DeferredTaxAssetsLiabilitiesNetFederal
State (5,228)lxu_DeferredTaxAssetsLiabilitiesNetState (4,582)lxu_DeferredTaxAssetsLiabilitiesNetState
Net deferred tax liabilities $ (65,924)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (53,085)us-gaap_DeferredTaxAssetsLiabilitiesNet