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Note 8 - Stockholders' Equity (Details) - Share Repurchases (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended						41 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2014
Equity, Class of Treasury Stock [Line Items]
Total purchase price (in thousands)	$ 22,968us-gaap_StockRepurchasedDuringPeriodValue		$ 7,903us-gaap_StockRepurchasedDuringPeriodValue		$ 23,279us-gaap_StockRepurchasedDuringPeriodValue
Common Class A [Member] | Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (1)	226,729us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = lad_ShareRepurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	[1]	127,900us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = lad_ShareRepurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	[1]	848,092us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = lad_ShareRepurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	[1]
Total purchase price (in thousands)	$ 15,990us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = lad_ShareRepurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember		$ 5,213us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = lad_ShareRepurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember		$ 20,698us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = lad_ShareRepurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Average purchase price per share	$ 70.52us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = lad_ShareRepurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember		$ 40.76us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = lad_ShareRepurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember		$ 24.41us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = lad_ShareRepurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class A [Member]
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (1)							1,499,776us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Average purchase price per share							$ 31.19us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
[1] Includes only shares repurchased under repurchase plans. An additional 106,772, 59,721 and 80,687 shares were repurchased in association with tax withholdings on the exercise of stock options in 2014, 2013 and 2012, respectively.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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