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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
	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%

X

- 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

X

- Details

Name:	lad_Note10StockBasedCompensationDetailsPercentageofGrantedRSUsEarnedBasedonAttainmentThresholdsLineItems
Namespace Prefix:	lad_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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