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Long-Term Debt - Future Maturities of Long-Term Debt (Details) $ in Thousands | Dec. 31, 2021 USD ($)
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Debt Disclosure [Abstract] |
2019 | $ 50,600
2020 | 76,100
2021 | 118,200
2022 | 88,600
2023 | 30,200
Thereafter | 1,222,400
Total | $ 1,586,100

X
- Definition The cash outflow for the maturities of all long-term borrowings, net of any premium or discounts, due six years from the period-end date and all year thereafter. + References No definition available. + Details
Name: | sah_DebtInstrumentNetOfUnamortizedDiscountOrPremiumAfterYearFive
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt instrument net of unamortized discount or premium next twelve months. + References No definition available. + Details
Name: | sah_DebtInstrumentNetOfUnamortizedDiscountOrPremiumNextTwelveMonths
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow for the maturities of all long-term borrowings, net of any premium or discounts, due five years from the period-end date. + References No definition available. + Details
Name: | sah_DebtInstrumentNetOfUnamortizedDiscountOrPremiumYearFive
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow for the maturities of all long-term borrowings, net of any premium or discounts, due four years from the period-end date. + References No definition available. + Details
Name: | sah_DebtInstrumentNetOfUnamortizedDiscountOrPremiumYearFour
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow for the maturities of all long-term borrowings, net of any premium or discounts, due three years from the period-end date. + References No definition available. + Details
Name: | sah_DebtInstrumentNetOfUnamortizedDiscountOrPremiumYearThree
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow for the maturities of all long-term borrowings, net of any premium or discounts, due two years from the period-end date. + References No definition available. + Details
Name: | sah_DebtInstrumentNetOfUnamortizedDiscountOrPremiumYearTwo
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Long term debt net of unamortized discount or premium including debt issuance costs. + References No definition available. + Details
Name: | sah_LongTermDebtNetOfUnamortizedDiscountOrPremiumIncludingDebtIssuanceCosts
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration