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