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Note 18 - Equity-Method Investment (Details) (NMTC Program [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	2 Months Ended
	Oct. 31, 2014	Dec. 31, 2014	Oct. 31, 2014
Note 18 - Equity-Method Investment (Details) [Line Items]
Equity Method Investment, Ownership Percentage	99.90%us-gaap_EquityMethodInvestmentOwnershipPercentage		99.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Investment, Equity Contribution Obligation	$ 37.1lad_EquityMethodInvestmentEquityContributionObligation		$ 37.1lad_EquityMethodInvestmentEquityContributionObligation
Equity Method Investment, Equity Contribution Obligation, Term	2 years
Payments to Acquire Equity Method Investments		4.1us-gaap_PaymentsToAcquireEquityMethodInvestments
Other Noncurrent Assets [Member]
Note 18 - Equity-Method Investment (Details) [Line Items]
Equity Method Investments		33.3us-gaap_EquityMethodInvestments / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lad_NMTCProgramMember
Accrued Liabilities and Other Long-term Liabilities [Member]
Note 18 - Equity-Method Investment (Details) [Line Items]
Equity Method Investment, Equity Contribution Obligation, Present Value		$ 32.2lad_EquityMethodInvestmentEquityContributionObligationPresentValue / us-gaap_BalanceSheetLocationAxis = lad_AccruedLiabilitiesAndOtherLongTermLiabilitiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lad_NMTCProgramMember

X

- Definition

Represents the equity contribution obligation associated with an equity method investment.

+ References

No definition available.

+ Details

Name:	lad_EquityMethodInvestmentEquityContributionObligation
Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the equity contribution obligation present value associated with an equity method investment.

+ References

No definition available.

+ Details

Name:	lad_EquityMethodInvestmentEquityContributionObligationPresentValue
Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the equity contribution obligation term associated with an equity method investment.

+ References

No definition available.

+ Details

Name:	lad_EquityMethodInvestmentEquityContributionObligationTerm
Namespace Prefix:	lad_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	lad_Note18EquityMethodInvestmentDetailsLineItems
Namespace Prefix:	lad_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

+ Details

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

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