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Business Combinations (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 USD ($) retail_Units | Jun. 30, 2020 USD ($) Business
Business Combinations [Abstract] |  |
Number of franchises disposed | 1 | 1
Proceeds from sales of dealerships | $ 3,798 | $ (886)

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- References No definition available. + Details
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Namespace Prefix: | sah_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration