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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: |