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Property and Business Interruption Insurance Claims and Recoveries - Additional Information (Detail) (USD $) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended |  | 3 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2013 El Dorado Facility [Member] | Mar. 31, 2013 El Dorado Facility [Member] | Dec. 31, 2012 El Dorado Facility [Member] | Mar. 31, 2013 El Dorado Facility [Member] Property insurance [Member] | Dec. 31, 2012 El Dorado Facility [Member] Property insurance [Member] | Dec. 31, 2012 El Dorado Facility [Member] Property insurance [Member] Cost of sales [Member] | Mar. 31, 2013 El Dorado Facility [Member] Business interruption insurance [Member] | Dec. 31, 2012 El Dorado Facility [Member] Business interruption insurance [Member] | Mar. 31, 2013 El Dorado Facility [Member] Business interruption insurance [Member] Cost of sales [Member] | Mar. 31, 2013 El Dorado Facility [Member] DSN Plant [Member] | Mar. 31, 2013 Cherokee Facility [Member] | Mar. 31, 2013 Cherokee Facility [Member] Property insurance [Member] | Mar. 31, 2013 Cherokee Facility [Member] Business interruption insurance [Member] | Mar. 31, 2013 Cherokee Facility [Member] Business interruption insurance [Member] Cost of sales [Member] | Mar. 31, 2013 Pryor Facility [Member]
Property And Or Business Interruption Insurance Claims [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deductible property damage under insurance |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  | $ 2,500,000 |  |  | $ 1,000,000
Waiting period for business interruption coverage |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  | 30 days |  | 30 days
Repair cost - estimated lower range |  |  |  |  |  |  |  |  |  |  |  | 48,000,000 |  |  |  |  |
Repair cost - estimated upper range |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  |  |  |  |
Approved insurance payments received |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Approved insurance payments |  |  |  |  | 40,000,000 |  | 28,600,000 |  |  | 11,400,000 |  |  |  |  |  |  |
Approved insurance payments with reservation of rights |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |
Insurance claim recoverable costs |  |  |  | 8,000,000 |  |  | 22,400,000 | 7,300,000 |  |  | 700,000 |  |  |  |  | 10,100,000 |
Deferred gain on insurance recovery | 9,617,000 |  |  |  |  | 6,200,000 |  |  | 3,400,000 |  |  |  |  |  |  |  |
Insurance recoveries in excess of recoverable costs, not recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,900,000 |  |
Insurance claim receivable | $ 12,064,000 | $ 10,059,000 |  |  |  |  |  |  |  |  |  |  | $ 12,100,000 |  |  |  |

X
- Definition Amount approved by an insurance company in settlement or partial settlement of a claim for reimbursement when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | lxu_AmountApprovedUnderInsuranceClaim
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deductible For Property Damage + References No definition available. + Details
Name: | lxu_DeductibleForPropertyDamage
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain contingency relating to an insurance recovery that was deferred as of the balance sheet date. + References No definition available. + Details
Name: | lxu_DeferredGainOnInsuranceRecovery
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of recoverable costs included in an insurance claim. + References No definition available. + Details
Name: | lxu_InsuranceClaimRecoverableCosts
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amounts due for claims covered under insurance policies and to be paid by our insurance companies. + References No definition available. + Details
Name: | lxu_InsuranceClaimsReceivable
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of insurance recoveries in excess of recoverable costs, which did not meet the criteria for recognition. + References No definition available. + Details
Name: | lxu_InsuranceRecoveriesInExcessOfRecoverableCostsNotRecognized
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Proceeds from insurance recoveries. + References No definition available. + Details
Name: | lxu_ProceedsFromInsuranceRecoveries
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from insurance recoveries with reservation of rights. + References No definition available. + Details
Name: | lxu_ProceedsFromInsuranceRecoveriesWithReservationOfRights
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | lxu_PropertyAndOrBusinessInterruptionInsuranceClaimsLineItems
Namespace Prefix: | lxu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The estimated lower range of repair cost. + References No definition available. + Details
Name: | lxu_RepairCostEstimatedLowerRange
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The estimated upper range of repair cost. + References No definition available. + Details
Name: | lxu_RepairCostEstimatedUpperRange
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Waiting period before costs can be included in a claim for business interruption insurance coverage. + References No definition available. + Details
Name: | lxu_WaitingPeriodForBusinessInterruptionInsuranceCoverage
Namespace Prefix: | lxu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration