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Note 13 - Transition Agreement (Details Textual) - Executive Chairman [Member] $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Selling, General and Administrative Expenses [Member]
Transition Agreement Expense	$ 18.3	$ 18.3
Accrued Liabilities and Other Long Term Liabilities [Member]
Transition Agreement, Accrued Liabilities	$ 18.3	$ 18.3

X

- Definition

Represents the carrying value as of the balance sheet date of obligations related to the Transition Agreement.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount of charge recorded in the period associated with the Transition Agreement.

+ References

No definition available.

+ Details

Name:	lad_TransitionAgreementExpense
Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_TitleOfIndividualAxis=lad_ExecutiveChairmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=lad_AccruedLiabilitiesAndOtherLongTermLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: