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Note 7 - Deferred Compensation and Long-term Incentive Plans (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012
Note 7 - Deferred Compensation and Long-term Incentive Plans (Details) [Line Items]
Deferred Compensation Arrangement with Individual, Employer Contribution	$ 2.0
Guaranteed Return						5.25%
Deferred Compensation Arrangement with Individual, Compensation Expense		0.4	0.3	0.7	0.6
Deferred Compensation Liability, Classified, Noncurrent		$ 5.2		$ 5.2			$ 3.6
Minimum [Member]
Note 7 - Deferred Compensation and Long-term Incentive Plans (Details) [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Service Period		1 year		1 year
Maximum [Member]
Note 7 - Deferred Compensation and Long-term Incentive Plans (Details) [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Service Period		7 years		7 years

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	lad_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1
Namespace Prefix:	lad_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

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

- Details

Name:	lad_Note7DeferredCompensationandLongtermIncentivePlansDetailsLineItems
Namespace Prefix:	lad_
Data Type:	xbrli:stringItemType
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

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

X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant