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Note 13 - Income Taxes (Details) - Unrecognized Tax Benefits (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Unrecognized Tax Benefits [Abstract]
Balance	$ 0us-gaap_UnrecognizedTaxBenefits
Acquired with acquisition	1,495us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition
Balance	$ 1,495us-gaap_UnrecognizedTaxBenefits

X

- Details

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

X

- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

+ Details

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X

- Definition

Amount of increase in unrecognized tax benefits resulting from acquisitions.

+ References

No definition available.

+ Details

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