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Note 12 - Equity-Method Investment (Details Textual) - NMTC Program [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2014	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2015
Equity Method Investment, Ownership Percentage	99.90%
Payments to Acquire Equity Method Investments	$ 4.1	$ 5.7	$ 17.1	$ 21.2
Equity Method Investment Equity Contribution Obligation		$ 49.8	$ 49.8	$ 49.8
Equity Method Investment Equity Contribution Obligation Term			2 years

X

- Definition

Represents the equity contribution obligation associated with an equity method investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the equity contribution obligation term associated with an equity method investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:durationItemType
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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 323



-SubTopic 10



-Section 50



-Paragraph 3



-Subparagraph (a)(1)



-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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X

- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 13



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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