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Note 7 - Deferred Compensation and Long-term Incentive Plans (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Note 7 - Deferred Compensation and Long-term Incentive Plans (Details) [Line Items] |  |
Deferred Compensation Arrangement with Individual, Employer Contribution | $ 2.1 |
Guaranteed Return | 5.25% |
Deferred Compensation Liability, Classified, Noncurrent | $ 6.3 | $ 3.6
Minimum [Member] |  |
Note 7 - Deferred Compensation and Long-term Incentive Plans (Details) [Line Items] |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 1 year |
Maximum [Member] |  |
Note 7 - Deferred Compensation and Long-term Incentive Plans (Details) [Line Items] |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 7 years |

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | lad_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1
Namespace Prefix: | lad_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition The annual return percentage guaranteed on balances in an employee's deferred compensation account + References No definition available. + Details
Name: | lad_GuaranteedReturn
Namespace Prefix: | lad_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | lad_Note7DeferredCompensationandLongtermIncentivePlansDetailsLineItems
Namespace Prefix: | lad_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant