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Segment Information - PP&E and Total Assets by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | $ 35,664 us-gaap_Depreciation | $ 28,310 us-gaap_Depreciation | $ 20,681 us-gaap_Depreciation
Additions to PP&E: |  |  |
Total additions to PP&E | 240,104 us-gaap_PropertyPlantAndEquipmentAdditions | 166,419 us-gaap_PropertyPlantAndEquipmentAdditions | 150,805 us-gaap_PropertyPlantAndEquipmentAdditions
Total assets at December 31: |  |  |
Total assets | 1,137,005 us-gaap_Assets | 1,083,097 us-gaap_Assets | 576,612 us-gaap_Assets
Operating Segments [Member] | Chemical [Member] |  |  |
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | 30,364 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | 23,497 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | 16,355 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember
Additions to PP&E: |  |  |
Total additions to PP&E | 238,070 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | 160,343 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | 141,399 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember
Total assets at December 31: |  |  |
Total assets | 929,745 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | 842,725 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember | 394,479 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ChemicalMember
Operating Segments [Member] | Climate Control [Member] |  |  |
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | 4,946 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ClimateControlMember | 4,707 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ClimateControlMember | 4,250 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ClimateControlMember
Additions to PP&E: |  |  |
Total additions to PP&E | 1,859 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ClimateControlMember | 5,576 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ClimateControlMember | 5,816 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ClimateControlMember
Total assets at December 31: |  |  |
Total assets | 133,183 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ClimateControlMember | 159,960 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ClimateControlMember | 139,526 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lxu_ClimateControlMember
Operating Segments [Member] | Other [Member] |  |  |
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | 34 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember | 49 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember | 32 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember
Additions to PP&E: |  |  |
Total additions to PP&E | 27 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember | 65 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember | 889 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember
Total assets at December 31: |  |  |
Total assets | 5,960 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember | 6,832 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember | 8,204 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember
Corporate [Member] | Corporate Assets [Member] |  |  |
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | 320 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = lxu_CorporateAssetsAndOtherMember | 57 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = lxu_CorporateAssetsAndOtherMember | 44 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = lxu_CorporateAssetsAndOtherMember
Additions to PP&E: |  |  |
Total additions to PP&E | 148 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = lxu_CorporateAssetsAndOtherMember | 435 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = lxu_CorporateAssetsAndOtherMember | 2,701 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = lxu_CorporateAssetsAndOtherMember
Total assets at December 31: |  |  |
Total assets | $ 68,117 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = lxu_CorporateAssetsAndOtherMember | $ 73,580 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = lxu_CorporateAssetsAndOtherMember | $ 34,403 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = lxu_CorporateAssetsAndOtherMember

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