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Long-Term Debt - Future Maturities of Long-Term Debt (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Debt Disclosure [Abstract] |
2019 | $ 26,304
2020 | 59,756
2021 | 53,385
2022 | 43,187
2023 | 351,314
Thereafter | 422,071
Total | $ 956,017

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