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Segment Information - Segment Financial Information (Parenthetical) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Interest cost capitalized | $ 14,100,000 us-gaap_InterestCostsCapitalized | $ 4,000,000 us-gaap_InterestCostsCapitalized | $ 400,000 us-gaap_InterestCostsCapitalized
Chemical [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property insurance recoveries | 5,100,000 us-gaap_InsuranceRecoveries / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | 66,300,000 us-gaap_InsuranceRecoveries / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | 0 us-gaap_InsuranceRecoveries / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember
Cost of Sales [Member] | Chemical [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Business interruption loss | $ 22,900,000 lxu_InsuranceClaimRecoverableCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | $ 28,400,000 lxu_InsuranceClaimRecoverableCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | $ 7,300,000 lxu_InsuranceClaimRecoverableCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember

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- 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

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- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_InsuranceRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
Name: | us-gaap_InterestCostsCapitalized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lxu_ChemicalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |