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Note 19 - Segments (Details) - Certain Segment Financial Information (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues:
Revenues	$ 5,390,326us-gaap_Revenues		$ 4,005,749us-gaap_Revenues		$ 3,316,487us-gaap_Revenues
Segment income*:
Income from continuing operations before income taxes	210,495us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest		165,788us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest		128,457us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Floor plan interest expense:
Floor Plan Interest Expense	13,861lad_FloorPlanInterestExpense		12,373lad_FloorPlanInterestExpense		12,816lad_FloorPlanInterestExpense
Operating Segments [Member] | Domestic [Member]
Revenues:
Revenues	2,569,904us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember		2,147,417us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember		1,832,040us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember
Segment income*:
Income from continuing operations before income taxes	96,358us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]	84,352us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]	69,234us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember	[1]
Floor plan interest expense:
Floor Plan Interest Expense	17,895lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember		15,254lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember		12,334lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_DomesticMember
Operating Segments [Member] | Import [Member]
Revenues:
Revenues	1,889,166us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember		1,223,861us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember		976,706us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember
Segment income*:
Income from continuing operations before income taxes	49,940us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]	40,390us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]	30,776us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember	[1]
Floor plan interest expense:
Floor Plan Interest Expense	9,396lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember		6,444lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember		3,521lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_ImportMember
Operating Segments [Member] | Luxury [Member]
Revenues:
Revenues	926,804us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember		629,521us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember		498,429us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember
Floor plan interest expense:
Floor Plan Interest Expense	5,098lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember		3,931lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember		2,483lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lad_LuxuryMember
Operating Segments [Member] | Luxury [Member]
Segment income*:
Income from continuing operations before income taxes	24,540us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementScenarioAxis = lad_LuxuryMember	[1]	16,128us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementScenarioAxis = lad_LuxuryMember	[1]	11,273us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementScenarioAxis = lad_LuxuryMember	[1]
Operating Segments [Member]
Revenues:
Revenues	5,385,874us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		4,000,799us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		3,307,175us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Segment income*:
Income from continuing operations before income taxes	170,838us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		140,870us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		111,283us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Floor plan interest expense:
Floor Plan Interest Expense	32,389lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		25,629lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember		18,338lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Corporate, Non-Segment [Member]
Revenues:
Revenues	4,452us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		4,950us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		9,312us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Segment income*:
Income from continuing operations before income taxes	39,657us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		24,918us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		17,174us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Floor plan interest expense:
Floor Plan Interest Expense	$ (18,528)lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		$ (13,256)lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember		$ (5,522)lad_FloorPlanInterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
[1] Segment income is defined as operating income less floor plan interest expense.

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- 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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- 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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- 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



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