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ACCOUNTS RECEIVABLE AND OTHER NON-CURRENT ASSETS - Additional Information (Details) | 6 Months Ended
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Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Period that contracts in transit are outstanding | 10 days
Threshold period for interest to bear on receivables | 60 days
Auto loan and lease receivables |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Receivables, 60 days or less past due, percent | 99.00%
Receivables, 60 days or less past due, non-accrual status, percent | 1.00%

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- Definition Accounts Receivable, Receipt of Payment, Period + References No definition available. + Details
Name: | lad_AccountsReceivableReceiptOfPaymentPeriod
Namespace Prefix: | lad_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Accounts Receivable, Threshold To Bear Interest, Period + References No definition available. + Details
Name: | lad_AccountsReceivableThresholdToBearInterestPeriod
Namespace Prefix: | lad_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, 60 Days Or Less Past Due, Nonaccrual Percent + References No definition available. + Details
Name: | lad_FinancingReceivable60DaysOrLessPastDueNonaccrualPercent
Namespace Prefix: | lad_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Financing Receivable, 60 Days Or Less Past Due, Percent + References No definition available. + Details
Name: | lad_FinancingReceivable60DaysOrLessPastDuePercent
Namespace Prefix: | lad_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=lad_AutoLoanAndLeaseReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |