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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from continuing operating activities    
Net income $ 6,649us-gaap_NetIncomeLoss $ 11,641us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by continuing operating activities:    
Deferred income taxes 3,176us-gaap_DeferredIncomeTaxExpenseBenefit 5,999us-gaap_DeferredIncomeTaxExpenseBenefit
Gains on property insurance recoveries associated with property, plant and equipment   (5,147)lxu_GainOnPropertyInsuranceRecoveriesAssociatedWithPropertyPlantAndEquipment
Depreciation, depletion and amortization of property, plant and equipment 9,001us-gaap_Depreciation 8,679us-gaap_Depreciation
Other (795)us-gaap_OtherNoncashIncomeExpense (111)us-gaap_OtherNoncashIncomeExpense
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable (2,348)us-gaap_IncreaseDecreaseInAccountsReceivable (9,876)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (1,477)us-gaap_IncreaseDecreaseInInventories 150us-gaap_IncreaseDecreaseInInventories
Prepaid insurance 3,744us-gaap_IncreaseDecreaseInPrepaidInsurance 3,772us-gaap_IncreaseDecreaseInPrepaidInsurance
Prepaid and accrued income taxes 4,640us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 8,247us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Other supplies, prepaid items and other 932us-gaap_IncreaseDecreaseInOtherOperatingAssets 3,540us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable 1,629us-gaap_IncreaseDecreaseInAccountsPayable 8,179us-gaap_IncreaseDecreaseInAccountsPayable
Accrued interest (8,086)us-gaap_IncreaseDecreaseInInterestPayableNet (7,547)us-gaap_IncreaseDecreaseInInterestPayableNet
Customer deposits (3,003)us-gaap_IncreaseDecreaseInCustomerDeposits (322)us-gaap_IncreaseDecreaseInCustomerDeposits
Other current and noncurrent liabilities (1,459)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (5,515)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Deferred gain on insurance recoveries   (1,383)lxu_IncreaseDecreaseDeferredGainOnInsuranceRecovery
Net cash provided by continuing operating activities 12,603us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 20,306us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from continuing investing activities    
Expenditures for property, plant and equipment (66,837)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (45,308)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from property insurance recovery associated with property, plant and equipment   5,147us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
Purchases of short-term investments (10,000)us-gaap_PaymentsToAcquireShortTermInvestments  
Proceeds from noncurrent restricted cash and cash equivalents 45,969us-gaap_DecreaseInRestrictedCash  
Deposits of current and noncurrent restricted cash and cash equivalents (31)us-gaap_IncreaseInRestrictedCash (165,106)us-gaap_IncreaseInRestrictedCash
Proceeds from noncurrent restricted investments   209,990us-gaap_ProceedsFromSaleOfRestrictedInvestments
Other investing activities (1,049)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 386us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash provided (used) by continuing investing activities (31,948)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 5,109us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from continuing financing activities    
Payments on long-term debt (2,881)us-gaap_RepaymentsOfLongTermDebt (2,322)us-gaap_RepaymentsOfLongTermDebt
Payments on short-term financing (3,566)us-gaap_RepaymentsOfShortTermDebt (4,073)us-gaap_RepaymentsOfShortTermDebt
Proceeds from exercises of stock options 742us-gaap_ProceedsFromStockOptionsExercised 78us-gaap_ProceedsFromStockOptionsExercised
Excess income tax benefit associated with stock-based compensation 129us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 300us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Dividends paid on preferred stocks (300)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (300)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Net cash used by continuing financing activities (5,876)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (6,317)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Cash flows of discontinued operations:    
Operating cash flows (32)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations (65)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net increase (decrease) in cash and cash equivalents (25,253)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 19,033us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 186,811us-gaap_CashAndCashEquivalentsAtCarryingValue 143,750us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 161,558us-gaap_CashAndCashEquivalentsAtCarryingValue $ 162,783us-gaap_CashAndCashEquivalentsAtCarryingValue