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Segment Information - General Corporate Expenses and Other Business Operations, Net (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Selling, general and administrative:    
Total selling, general and administrative $ (28,191)us-gaap_SellingGeneralAndAdministrativeExpense $ (27,658)us-gaap_SellingGeneralAndAdministrativeExpense
Operating income 14,223us-gaap_OperatingIncomeLoss 25,861us-gaap_OperatingIncomeLoss
Corporate [Member]    
Selling, general and administrative:    
Personnel costs (2,602)us-gaap_LaborAndRelatedExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(1,715)us-gaap_LaborAndRelatedExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Fees and expenses relating to shareholders (1,679)lxu_ActivistShareholderFeesAndExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(4,200)lxu_ActivistShareholderFeesAndExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Professional fees (1,544)us-gaap_ProfessionalFees
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(1,188)us-gaap_ProfessionalFees
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
All other (897)lxu_SellingGeneralAndAdministrativeOther
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(591)lxu_SellingGeneralAndAdministrativeOther
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Total selling, general and administrative (6,722)us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(7,694)us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Other income 24us-gaap_OtherOperatingIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
23us-gaap_OtherOperatingIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Other expense (49)us-gaap_OtherCostAndExpenseOperating
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
 
Operating income $ (6,747)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
$ (7,671)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember