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ACQUISITIONS - Summary of Acquisitions (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2022 USD ($)
2022 Acquisitions |
Business Acquisition [Line Items] |
Cash paid, net of cash acquired | $ 698.3

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- Definition Payments To Acquire Business, Net Of Cash Acquired, Preliminary + References No definition available. + Details
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Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=lad_A2022AcquisitionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |