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PROPERTY, EQUIPMENT AND FACILITIES (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Campus
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Jun. 30, 2012
Property, equipment and facilities net [Abstract]            
Property, equipment and facilities, Gross $ 206,650,000us-gaap_PropertyPlantAndEquipmentGross $ 206,650,000us-gaap_PropertyPlantAndEquipmentGross $ 274,127,000us-gaap_PropertyPlantAndEquipmentGross      
Less accumulated depreciation and amortization (136,910,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (136,910,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (146,795,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment      
Property, equipment and facilities, Net 69,740,000us-gaap_PropertyPlantAndEquipmentNet 69,740,000us-gaap_PropertyPlantAndEquipmentNet 127,332,000us-gaap_PropertyPlantAndEquipmentNet      
Depreciation and amortization expense   19,100,000us-gaap_Depreciation 23,300,000us-gaap_Depreciation 26,400,000us-gaap_Depreciation    
Long Lived Assets Held-for-sale [Line Items]            
Inventories 411,000us-gaap_InventoriesPropertyHeldForSaleCurrent 411,000us-gaap_InventoriesPropertyHeldForSaleCurrent 0us-gaap_InventoriesPropertyHeldForSaleCurrent      
Accounts receivable, less allowance of $1,545 at December 31, 2014 1,527,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet 1,527,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet 0us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet      
Noncurrent receivables, less allowance of 95 at December 31, 2014 671,000linc_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNoncurrent 671,000linc_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNoncurrent 0linc_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNoncurrent      
Property, equipment and facilities - at cost, net of accumluated depreciation and amortization of $17,843 and $1,418 at December 31, 2014 and 2013, respectively 50,252,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment 50,252,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment 6,310,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment      
Unearned tuition (2,536,000)linc_DisposalGroupIncludingDiscontinuedOperationUnearnedTuition (2,536,000)linc_DisposalGroupIncludingDiscontinuedOperationUnearnedTuition 0linc_DisposalGroupIncludingDiscontinuedOperationUnearnedTuition      
Accrued expenses (699,000)linc_DisposalGroupIncludingDiscontinuedOperationAccruedExpenses (699,000)linc_DisposalGroupIncludingDiscontinuedOperationAccruedExpenses 0linc_DisposalGroupIncludingDiscontinuedOperationAccruedExpenses      
Goodwill 1,304,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 1,304,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 0us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 4,500,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 1,900,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 8,400,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1
Assets held for sale, net 50,930,000us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets 50,930,000us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets 6,310,000us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets      
Number of campuses held for sale 2linc_NumberOfCampusesHeldForSale          
Long Lived Assets Held For Sale Parenthetical data [Abstract]            
Accounts receivable, allowance 1,545,000linc_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableLessAccountReceivablesAllowance 1,545,000linc_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableLessAccountReceivablesAllowance        
Noncurrent receivables, allowance 95,000linc_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableLessAccountReceivablesAllowanceNoncurrent 95,000linc_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableLessAccountReceivablesAllowanceNoncurrent        
Property, equipment and facilities - accumulated depreciation and amortization 17,843,000linc_DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 17,843,000linc_DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 1,418,000linc_DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment      
Land [Member]            
Property, equipment and facilities net [Abstract]            
Property, equipment and facilities, Gross 5,338,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 5,338,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 17,562,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		      
Buildings and Improvements [Member]            
Property, equipment and facilities net [Abstract]            
Property, equipment and facilities, Gross 128,973,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 128,973,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 178,089,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		      
Capital leased assets, gross 26,800,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 26,800,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 26,800,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		      
Capital leased assets, accumulated depreciation 10,600,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 10,600,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 8,800,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		      
Capitalized interest cost 600,000us-gaap_AccumulatedCapitalizedInterestCosts
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 600,000us-gaap_AccumulatedCapitalizedInterestCosts
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 600,000us-gaap_AccumulatedCapitalizedInterestCosts
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		      
Accumulated depreciation on capitalized interest cost 500,000linc_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentCapitalizedInterestCost
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 500,000linc_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentCapitalizedInterestCost
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		 400,000linc_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentCapitalizedInterestCost
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		      
Buildings and Improvements [Member] | Minimum [Member]            
Property, equipment and facilities net [Abstract]            
Useful life (years)   1 year        
Buildings and Improvements [Member] | Maximum [Member]            
Property, equipment and facilities net [Abstract]            
Useful life (years)   25 years        
Equipment, Furniture and Fixtures [Member]            
Property, equipment and facilities net [Abstract]            
Property, equipment and facilities, Gross 71,005,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= linc_EquipmentFurnitureAndFixturesMember		 71,005,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= linc_EquipmentFurnitureAndFixturesMember		 76,769,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= linc_EquipmentFurnitureAndFixturesMember		      
Capital leased assets, gross 400,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= linc_EquipmentFurnitureAndFixturesMember		 400,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= linc_EquipmentFurnitureAndFixturesMember		 400,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= linc_EquipmentFurnitureAndFixturesMember		      
Capital leased assets, accumulated depreciation 400,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= linc_EquipmentFurnitureAndFixturesMember		 400,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= linc_EquipmentFurnitureAndFixturesMember		 400,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= linc_EquipmentFurnitureAndFixturesMember		      
Equipment, Furniture and Fixtures [Member] | Minimum [Member]            
Property, equipment and facilities net [Abstract]            
Useful life (years)   1 year        
Equipment, Furniture and Fixtures [Member] | Maximum [Member]            
Property, equipment and facilities net [Abstract]            
Useful life (years)   7 years        
Vehicles [Member]            
Property, equipment and facilities net [Abstract]            
Useful life (years)   3 years        
Property, equipment and facilities, Gross 1,300,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember		 1,300,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember		 1,282,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember		      
Construction in Progress [Member]            
Property, equipment and facilities net [Abstract]            
Property, equipment and facilities, Gross $ 34,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		 $ 34,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		 $ 425,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember