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Note 16 - Related Party Transactions (Details) (USD $)
12 Months Ended 9 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2013
Mar. 27, 2012
Note 16 - Related Party Transactions (Details) [Line Items]          
Proceeds from Divestiture of Businesses, Net of Cash Divested $ 10,617,000us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested $ 6,618,000us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested      
Sale of Nissan Volkswagen and BMW Stores [Member]          
Note 16 - Related Party Transactions (Details) [Line Items]          
Related Party Transaction Sale Ownership Percentage         80.00%lad_RelatedPartyTransactionSaleOwnershipPercentage
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfNissanVolkswagenAndBMWStoresMember
Related Party Transaction, Amounts of Transaction     9,600,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfNissanVolkswagenAndBMWStoresMember
   
Proceeds from Divestiture of Businesses, Net of Cash Divested     2,900,000us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfNissanVolkswagenAndBMWStoresMember
   
Noncash or Part Noncash Divestiture, Amount of Consideration Received     6,700,000us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfNissanVolkswagenAndBMWStoresMember
   
Gain (Loss) on Disposition of Business     700,000us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfNissanVolkswagenAndBMWStoresMember
   
Agreement Purchase Price Intangible Assets   1,200,000lad_AgreementPurchasePriceIntangibleAssets
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfNissanVolkswagenAndBMWStoresMember
1,200,000lad_AgreementPurchasePriceIntangibleAssets
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfNissanVolkswagenAndBMWStoresMember
   
Equity Method Investment, Ownership Percentage         20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfNissanVolkswagenAndBMWStoresMember
Sale of Land [Member]          
Note 16 - Related Party Transactions (Details) [Line Items]          
Related Party Transaction, Amounts of Transaction       4,200,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfLandMember
 
Gain (Loss) on Disposition of Assets       2,500,000us-gaap_GainLossOnDispositionOfAssets1
/ us-gaap_RelatedPartyTransactionAxis
= lad_SaleOfLandMember
 
Nissan, Volkswagen and BMW Stores in Medford, Oregon [Member] | Other Noncurrent Assets [Member]          
Note 16 - Related Party Transactions (Details) [Line Items]          
Equity Method Investments 1,200,000us-gaap_EquityMethodInvestments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lad_NissanVolkswagenAndBMWStoresInMedfordOregonMember
       
Remaining 20 Interest [Member]          
Note 16 - Related Party Transactions (Details) [Line Items]          
Equity Method Investments         800,000us-gaap_EquityMethodInvestments
/ lad_DisclosureAxis
= lad_Remaining20InterestMember
Income (Loss) from Equity Method Investments   $ 200,000us-gaap_IncomeLossFromEquityMethodInvestments
/ lad_DisclosureAxis
= lad_Remaining20InterestMember