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Note 4 - Goodwill and Franchise Value (Details) - Goodwill (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Goodwill [Line Items]
Balance	$ 199,286us-gaap_Goodwill	[1]	$ 199,375us-gaap_Goodwill	[1]	$ 49,511us-gaap_Goodwill	[1]
Reduction related to divestiture	(89)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Additions through acquisitions			149,864us-gaap_GoodwillAcquiredDuringPeriod
Domestic [Member]
Goodwill [Line Items]
Balance	91,011us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]	91,011us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]	22,548us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]
Additions through acquisitions			68,463us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember
Import [Member]
Goodwill [Line Items]
Balance	79,512us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]	79,601us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]	16,797us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]
Reduction related to divestiture	(89)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember
Additions through acquisitions			62,804us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember
Luxury [Member]
Goodwill [Line Items]
Balance	28,763us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember	[1]	28,763us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember	[1]	10,166us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember	[1]
Additions through acquisitions			$ 18,597us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember
[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

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

+ Details

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_GoodwillLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of divestiture 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

-Subparagraph (d)

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

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lad_DomesticMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lad_ImportMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lad_LuxuryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: