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Note 10 - Stock Based Compensation (Details) - Percentage of Granted RSUs Earned Based on Attainment Thresholds (Performance RSU [Member], USD $) | 12 Months Ended
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Dec. 31, 2013
Attainment Level 1 [Member] |
Note 10 - Stock Based Compensation (Details) - Percentage of Granted RSUs Earned Based on Attainment Thresholds [Line Items] |
Adjusted fiscal earnings per share attainment level (in Dollars per share) | $ 4.00
% of earned RSUs | 33.00%
Attainment Level 2 [Member] |
Note 10 - Stock Based Compensation (Details) - Percentage of Granted RSUs Earned Based on Attainment Thresholds [Line Items] |
Adjusted fiscal earnings per share attainment level (in Dollars per share) | $ 5.00
% of earned RSUs | 33.00%
Attainment Level 3 [Member] |
Note 10 - Stock Based Compensation (Details) - Percentage of Granted RSUs Earned Based on Attainment Thresholds [Line Items] |
Adjusted fiscal earnings per share attainment level (in Dollars per share) | $ 6.00
% of earned RSUs | 34.00%

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- Definition Description of an award term representing attainments level used to determine the number of restricted stock units earned once certain performance levels have been met + References No definition available. + Details
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Namespace Prefix: | lad_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Target level of earnings per share. + References No definition available. + Details
Name: | lad_ShareBasedCompensationArrangementByShareBasedPaymentAwardAttainmentLevelOfEarningsPerShare
Namespace Prefix: | lad_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration