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Note 12 - Segments (Details) - Certain Segment Financial Information (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Revenues:
Revenues	$ 1,789,178us-gaap_Revenues		$ 1,078,106us-gaap_Revenues
Segment income*:
Income from continuing operations before income taxes	58,056us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	[1]	40,704us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	[1]
Floor plan interest expense:
Floor Plan Interest Expense	4,649lad_FloorPlanInterestExpense		2,984lad_FloorPlanInterestExpense
Operating Segments [Member] | Domestic [Member]
Revenues:
Revenues	691,404us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember		568,930us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember
Segment income*:
Income from continuing operations before income taxes	27,129us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]	22,421us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]
Floor plan interest expense:
Floor Plan Interest Expense	4,736lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember		4,058lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember
Operating Segments [Member] | Import [Member]
Revenues:
Revenues	758,638us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember		351,061us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember
Segment income*:
Income from continuing operations before income taxes	16,100us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]	9,265us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]
Floor plan interest expense:
Floor Plan Interest Expense	3,698lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember		1,808lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember
Operating Segments [Member] | Luxury [Member]
Revenues:
Revenues	336,922us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember		158,611us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember
Segment income*:
Income from continuing operations before income taxes	5,899us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember	[1]	2,185us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember	[1]
Floor plan interest expense:
Floor Plan Interest Expense	2,062lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember		1,129lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember
Operating Segments [Member]
Revenues:
Revenues	1,786,964us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		1,078,602us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Segment income*:
Income from continuing operations before income taxes	49,128us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	[1]	33,871us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	[1]
Floor plan interest expense:
Floor Plan Interest Expense	10,496lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		6,995lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Corporate, Non-Segment [Member]
Revenues:
Revenues	2,214us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		(496)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Segment income*:
Income from continuing operations before income taxes	8,928us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	[1]	6,833us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	[1]
Floor plan interest expense:
Floor Plan Interest Expense	$ (5,847)lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		$ (4,011)lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
[1] Segment income is defined as operating income less floor plan interest expense.

X

- Definition

Interest expense incurred on vehicle floor plan payable trade and non-trade outstanding during the period.

+ References

No definition available.

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- Details

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Namespace Prefix:	lad_
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X

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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Period Type:	duration

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