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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Guarantors
Dec. 31, 2014
Working Capital Revolver Loan [Member]    
Debt Instrument [Line Items]    
Maximum amount of revolving credit facility 100.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= lxu_WorkingCapitalRevolverLoanMember
 
Amount available for borrowing 75.6us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= lxu_WorkingCapitalRevolverLoanMember
 
Maturity date Apr. 13, 2018  
7.75% Senior Secured Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Debt instrument, interest rate 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= lxu_SevenPointSevenFivePercentageSeniorNotesMember
7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= lxu_SevenPointSevenFivePercentageSeniorNotesMember
Maturity year 2019 2019
Maturity date Aug. 01, 2019  
Debt instrument, frequency of interest payment Interest is to be paid semiannually on February 1st and August 1st  
Number of unsecured guarantors 2lxu_NumberOfUnsecuredGuarantors
/ us-gaap_LongtermDebtTypeAxis
= lxu_SevenPointSevenFivePercentageSeniorNotesMember
 
Secured Promissory Note Due 2016 [Member]    
Debt Instrument [Line Items]    
Maturity year 2016 2016
Secured Promissory Note, interest rate 3.26%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= lxu_SecuredPromissoryNoteMember
3.26%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= lxu_SecuredPromissoryNoteMember
Other [Member]    
Debt Instrument [Line Items]    
Weighted-average interest rate of other debt 4.34%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= lxu_OtherLongTermDebtMember
4.34%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= lxu_OtherLongTermDebtMember