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v3.20.2

Long-Term Debt - 2019 Mortgage Facility (Details) | Jun. 30, 2020 $ / shares
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6.125% Notes |
Debt Instrument [Line Items] |
Maximum dividend (usd per share) | $ 0.12
2019 Mortgage Facility [Member] |
Debt Instrument [Line Items] |
Maximum dividend (usd per share) | $ 0.10

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- References No definition available. + Details
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Namespace Prefix: | sah_
Data Type: | num:perShareItemType
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=sah_SixPointOneTwoFivePercentSeniorSubordinateNoteDueTwoThousandTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=sah_A2019MortgageFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |