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Note 6 - Credit Facilities and Long-term Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Oct. 01, 2014	Dec. 31, 2013		Feb. 28, 2015
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Disposal Group, Including Discontinued Operation, Liabilities (in Dollars)	4,892,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation			$ 6,271,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Principal Reduction Accounts Maximum Deposit Amount (in Dollars)			50,000,000lad_PrincipalReductionAccountsMaximumDepositAmount
Principal Reduction Accounts Outstanding Amount (in Dollars)	0lad_PrincipalReductionAccountsOutstandingAmount
Debt Covenant Current Ratio	1.20lad_DebtCovenantCurrentRatio
Current Ratio	1.16lad_CurrentRatio
Debt Covenant Fixed Charge Coverage Ratio	1.20lad_DebtCovenantFixedChargeCoverageRatio
Fixed Charge Coverage Ratio	3.30lad_FixedChargeCoverageRatio
Debt Covenant Leverage Ratio	5.00lad_DebtCovenantLeverageRatio
Leverage Ratio	2.21lad_LeverageRatio
Debt Covenant Funded Debt Restriction (in Dollars)	600,000,000lad_DebtCovenantFundedDebtRestriction
Long-term Debt, Excluding Current Maturities (in Dollars)	374,000,000us-gaap_LongTermDebtNoncurrent
Floor Plan Notes Payable (in Dollars)	41,047,000lad_FloorPlanNotesPayable	[1]		18,789,000lad_FloorPlanNotesPayable	[1]
Long-term Debt (in Dollars)	640,978,000us-gaap_LongTermDebt
New Vehicle Floor Plan [Member] | Assets Held-for-sale [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Disposal Group, Including Discontinued Operation, Liabilities (in Dollars)	4,900,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_ShortTermDebtTypeAxis = lad_NewVehicleFloorPlanMember
Subsequent Event [Member] | Syndicated Credit Facility [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Covenant Current Ratio						1.10lad_DebtCovenantCurrentRatio / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Scenario, Subject to Lender Approval [Member] | Syndicated Credit Facility [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			1,850,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember / us-gaap_StatementScenarioAxis = lad_ScenarioSubjectToLenderApprovalMember
Reallocation [Member] | Syndicated Credit Facility [Member] | Used Vehicle Inventory Financing [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = lad_UsedVehicleInventoryFinancingMember / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember / us-gaap_StatementScenarioAxis = lad_ReallocationMember
Reallocation [Member] | Syndicated Credit Facility [Member] | Revolving Credit Facility [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember / us-gaap_StatementScenarioAxis = lad_ReallocationMember
Assets Held-for-sale [Member] | New Vehicle Floor Plan [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Disposal Group, Including Discontinued Operation, Liabilities (in Dollars)				4,800,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_CreditFacilityAxis = lad_NewVehicleFloorPlanMember / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember
Assets Held-for-sale [Member] | Vehicles Designated As Service Loaners [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Disposal Group, Including Discontinued Operation, Liabilities (in Dollars)				1,500,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_CreditFacilityAxis = lad_VehiclesDesignatedAsServiceLoanersMember / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember
Mortgages [Member] | Minimum [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Mortgages [Member] | Maximum [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Mortgages [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Total Debt Fixed Rate Percent	66.00%lad_TotalDebtFixedRatePercent / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Other 1 [Member] | Minimum [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lad_Other1Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Other 1 [Member] | Maximum [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lad_Other1Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Other 1 [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Long-term Debt (in Dollars)	37,800,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = lad_Other1Member
Syndicated Credit Facility [Member] | New Vehicle Floor Plan [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			1,250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = lad_NewVehicleFloorPlanMember / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember
Syndicated Credit Facility [Member] | Used Vehicle Inventory Financing [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = lad_UsedVehicleInventoryFinancingMember / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember
Syndicated Credit Facility [Member] | Revolving Credit Facility [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember
Syndicated Credit Facility [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			1,700,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember
Number of Financial Institutions			16lad_NumberOfFinancialInstitutions / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember
Number of Manufacturer-Affiliated Finance Companies			7lad_NumberOfManufacturerAffiliatedFinanceCompanies / us-gaap_DebtInstrumentAxis = lad_SyndicatedCreditFacilityMember
Floor Plan Notes Payable [Member] | Minimum [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lad_FloorPlanNotesPayableMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Floor Plan Notes Payable [Member] | Maximum [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lad_FloorPlanNotesPayableMember / us-gaap_RangeAxis = us-gaap_MaximumMember
New Vehicle Floor Plan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = lad_NewVehicleFloorPlanMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
New Vehicle Floor Plan [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)	1,250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = lad_NewVehicleFloorPlanMember			700,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = lad_NewVehicleFloorPlanMember
Reserve Commitment Percent	95.00%lad_ReserveCommitmentPercent / us-gaap_CreditFacilityAxis = lad_NewVehicleFloorPlanMember
Reserve Amount (in Dollars)	15,000,000lad_ReserveAmount / us-gaap_CreditFacilityAxis = lad_NewVehicleFloorPlanMember
Line of Credit Facility, Interest Rate During Period	1.40%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_CreditFacilityAxis = lad_NewVehicleFloorPlanMember
Used Vehicle Inventory Financing [Member] | London Interbank Offered Rate (LIBOR) [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = lad_UsedVehicleInventoryFinancingMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Used Vehicle Inventory Financing [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Line of Credit Facility, Interest Rate During Period	1.70%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_CreditFacilityAxis = lad_UsedVehicleInventoryFinancingMember
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Revolving Credit Facility [Member]
Note 6 - Credit Facilities and Long-term Debt (Details) [Line Items]
Number of Financial Institutions	16lad_NumberOfFinancialInstitutions / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Number of Manufacturer-Affiliated Finance Companies	7lad_NumberOfManufacturerAffiliatedFinanceCompanies / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Line of Credit Facility, Interest Rate During Period	2.20%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
[1] At December 31, 2014 and 2013, we had an additional $4.9 and $4.8 million of floor plan notes payable outstanding, respectively, on our new vehicle floor plan commitment recorded as liability related to assets held for sale. Additionally, at December 31, 2013, we had $1.5 million of floor plan notes payable on vehicles designated as service loaners recorded as liabilities related to assets held for sale.

X

- Definition

A ratio of current assets divided by current liabilities.

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A ratio defined in the credit agreement as fixed charges divided by earnings before interest, taxes, depreciation, amortization and rent (EBITDAR). Under the credit agreement, the company is required to remain in compliance with a minimum fixed charge coverage ratio.

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A ratio defined in the credit agreement as funded debt divided by earnings before interest, taxes, depreciation, amortization and rent (EBITDAR). Under the credit agreement, the company is required to remain in compliance with a maximum leverage ratio.

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Amounts borrowed to finance the purchase of specific new and program vehicle inventories with the corresponding manufacturers' captive finance subsidiaries.

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Amount on the revolving loan of credit availability that is reserved and may be used to repay outstanding balances on the new vehicle floor plan commitment.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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