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Note 5 - Goodwill and Franchise Value (Details) - Goodwill (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Goodwill [Line Items]
Balance as of December 31, 2012(1)	$ 49,511us-gaap_Goodwill	[1]	$ 32,047us-gaap_Goodwill	[1]
Additions through acquisitions	149,864us-gaap_GoodwillAcquiredDuringPeriod		17,464us-gaap_GoodwillAcquiredDuringPeriod
Balance	199,375us-gaap_Goodwill	[1]	49,511us-gaap_Goodwill	[1]
Domestic [Member]
Goodwill [Line Items]
Balance as of December 31, 2012(1)	22,548us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]	16,132us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]
Additions through acquisitions	68,463us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember		6,416us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember
Balance	91,011us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]	22,548us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]
Import [Member]
Goodwill [Line Items]
Balance as of December 31, 2012(1)	16,797us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]	8,715us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]
Additions through acquisitions	62,804us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember		8,082us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember
Balance	79,601us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]	16,797us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]
Luxury [Member]
Goodwill [Line Items]
Balance as of December 31, 2012(1)	10,166us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember	[1]	7,200us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember	[1]
Additions through acquisitions	18,597us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember		2,966us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember
Balance	$ 28,763us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember	[1]	$ 10,166us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember	[1]
[1] Net of accumulated impairment losses of $299.3 million recorded during the year ended December 31, 2008.

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Details

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Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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