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Note 6 - Deferred Compensation and Long-Term Incentive Plan (Details) - Compensation Expense - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Compensation Expense [Abstract]
Compensation expense	$ 463	$ 377	$ 920	$ 1,077
Discretionary contribution	$ 153		$ 2,249	$ 2,100
Guaranteed annual return	5.25%	5.25%	5.25%	5.25%

X

- References

No definition available.

+ Details

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

X

- Definition

The annual return percentage guaranteed on balances in an employee's deferred compensation account

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 1



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 710



-SubTopic 10



-Section 30



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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- 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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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