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Note 9 - 401(k) Profit Sharing, Deferred Compensation and Long-term Incentive Plans (Details) - Compensation Expense (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation Expense [Abstract]
Compensation expense (in millions)	$ 1.9us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense	$ 1.4us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense	$ 1.2us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Total discretionary contribution (in millions)	$ 2.4us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution	$ 2.1us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution	$ 1.9us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Guaranteed annual return	5.25%lad_GuaranteedReturn	5.25%lad_GuaranteedReturn	5.90%lad_GuaranteedReturn

X

- Details

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

X

- Definition

The annual return percentage guaranteed on balances in an employee's deferred compensation account

+ References

No definition available.

+ Details

Name:	lad_GuaranteedReturn
Namespace Prefix:	lad_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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

X

- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

+ References

No definition available.

+ Details

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