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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Unit
AssetsGroup
Jun. 30, 2013
Unit
AssetsGroup
Jun. 30, 2012
Unit
AssetsGroup
Dec. 31, 2014
StudyArea
School
Site
AssetsGroup
State
Dec. 31, 2013
Dec. 31, 2012
Unit
AssetsGroup
Dec. 03, 2014
Campus
Jun. 18, 2013
Campus
Mar. 31, 2013
AssetsGroup
Jul. 31, 2012
Campus
Dec. 31, 2011
Liquidity [Abstract]                      
Cash and cash equivalents       $ 12,299,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 12,886,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 61,708,000us-gaap_CashAndCashEquivalentsAtCarryingValue         $ 26,524,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Line of credit amount available       20,000,000us-gaap_LineOfCreditFacilityIncreaseDecreaseOtherNet              
Assets held for sale       50,930,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 6,310,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent            
Business Activities [Abstract]                      
Number of principal area of study       5linc_NumberOfPrincipalAreaOfStudy              
Number of schools operates across the United States       31linc_NumberOfSchools              
Number of training sites operates across the United States       5linc_NumberOfTrainingSites              
Number of states in which schools operates across the United States       15us-gaap_NumberOfStatesInWhichEntityOperates              
Cash and Cash Equivalents [Abstract]                      
Maximum maturity period for classification of cash equivalents       3 months              
Advertising Costs [Abstract]                      
Advertising expense       27,500,000us-gaap_AdvertisingExpense 29,000,000us-gaap_AdvertisingExpense 30,100,000us-gaap_AdvertisingExpense          
Goodwill and Other Intangible Assets [Abstract]                      
Number of units impaired 10linc_NumberOfUnitsImpaired 2linc_NumberOfUnitsImpaired 5linc_NumberOfUnitsImpaired     7linc_NumberOfUnitsImpaired          
Goodwill impairment loss pre tax charge 39,000,000linc_GoodwillImpairmentLossPreTaxCharge 3,100,000linc_GoodwillImpairmentLossPreTaxCharge 15,400,000linc_GoodwillImpairmentLossPreTaxCharge                
Goodwill impairment 39,300,000us-gaap_GoodwillAndIntangibleAssetImpairment         18,300,000us-gaap_GoodwillAndIntangibleAssetImpairment          
Goodwill, discontinued operations 1,900,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1   8,400,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 1,304,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 0us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 4,500,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1          
Concentration of Credit Risk [Abstract]                      
Federal deposit insurance limit       250,000linc_FederalDepositInsuranceLimitForCashWithFinancialInstitutions              
Excess cash, FDIC insured amount       41,200,000linc_ExcessCashFederalDepositInsuredAmount              
New Accounting Pronouncements [Abstract]                      
Number of training sites       5linc_NumberOfCampuses     5linc_NumberOfCampuses 5linc_NumberOfCampuses   7linc_NumberOfCampuses  
Impairment of Long-Lived Assets [Abstract]                      
Number of assets groups impaired 6linc_NumberOfAssetsGroupsImpaired 4linc_NumberOfAssetsGroupsImpaired 10linc_NumberOfAssetsGroupsImpaired 1linc_NumberOfAssetsGroupsImpaired   4linc_NumberOfAssetsGroupsImpaired     2linc_NumberOfAssetsGroupsImpaired    
Pretax charge related to impairment of long lived assets   1,400,000linc_AssetImpairmentPreTaxCharge   1,500,000linc_AssetImpairmentPreTaxCharge         1,700,000linc_AssetImpairmentPreTaxCharge    
Impairment related to discontinued operations 200,000linc_ImpairmentRelatedToDiscontinuedOperations 700,000linc_ImpairmentRelatedToDiscontinuedOperations 4,400,000linc_ImpairmentRelatedToDiscontinuedOperations     900,000linc_ImpairmentRelatedToDiscontinuedOperations     1,600,000linc_ImpairmentRelatedToDiscontinuedOperations    
Pre tax charge for impairment of leasehold improvements 500,000linc_PreTaxChargeForImpairmentOfLeaseholdImprovements   8,300,000linc_PreTaxChargeForImpairmentOfLeaseholdImprovements 1,900,000linc_PreTaxChargeForImpairmentOfLeaseholdImprovements   1,300,000linc_PreTaxChargeForImpairmentOfLeaseholdImprovements          
Pretax charges related to definite-lived intangible assets     $ 200,000linc_AssetImpairmentDefiniteLivedIntangibleAssets     $ 8,100,000linc_AssetImpairmentDefiniteLivedIntangibleAssets