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Note 10 - Assets Held for Sale and Discontinued Operations (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Import Store [Member] | Selling, General and Administrative Expenses [Member]
Gain (Loss) on Disposition of Business	$ 5,900,000
Gain (Loss) on Disposition of Business	$ 5,919,000	$ 5,744,000

X

- Definition

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=lad_ImportStoreMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: