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Long-Term Debt - 2019 Mortgage Facility (Details)	Jun. 30, 2021 $ / shares
2019 Mortgage Facility [Member]
Debt Instrument [Line Items]
Maximum dividend (usd per share)	$ 0.12

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- References

No definition available.

+ Details

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Namespace Prefix:	sah_
Data Type:	dtr-types: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_A2019MortgageFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: