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Note 12 - Segments (Details) - Certain Segment Financial Information - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenues		$ 1,996,947	$ 1,221,802	$ 3,786,125	$ 2,299,908
Income from continuing operations before income taxes	[1]	75,639	57,074	133,695	97,778
Floor plan interest expesne		4,655	3,215	9,304	6,199
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues		1,994,802	1,222,128	3,781,765	2,300,730
Income from continuing operations before income taxes	[1]	66,464	45,888	115,593	79,760
Floor plan interest expesne		10,964	7,344	21,460	14,339
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenues		2,145	(326)	4,360	(822)
Income from continuing operations before income taxes	[1]	9,175	11,186	18,102	18,018
Floor plan interest expesne		(6,309)	(4,129)	(12,156)	(8,140)
Domestic [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues		768,989	641,378	1,460,393	1,210,308
Income from continuing operations before income taxes	[1]	31,045	25,288	58,174	47,710
Floor plan interest expesne		4,932	4,404	9,669	8,463
Import [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues		853,444	394,924	1,612,082	745,985
Income from continuing operations before income taxes	[1]	25,904	14,768	42,005	24,033
Floor plan interest expesne		3,724	1,904	7,422	3,711
Luxury [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues		372,369	185,826	709,290	344,437
Income from continuing operations before income taxes	[1]	9,515	5,832	15,414	8,017
Floor plan interest expesne		$ 2,308	$ 1,036	$ 4,369	$ 2,165
[1] Segment income is defined as operating income less floor plan interest expense.

X

- Definition

Interest expense incurred on vehicle floor plan payable trade and non-trade outstanding during the period.

+ References

No definition available.

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Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 940



-SubTopic 20



-Section 25



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=51673353&loc=d3e41242-110953



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 235



-SubTopic 10



-Section S99



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 10



-Article 5

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

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Namespace Prefix:
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X

- Details

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- Details

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Period Type:

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- Details

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