XML 74 R57.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Long-Term Debt - Future Maturities of Long-Term Debt (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
--- | ---
Debt Disclosure [Abstract] |
Principal/Net ofDiscount/Premium, 2018 | $ 61,314
Principal/Net ofDiscount/Premium, 2019 | 25,179
Principal/Net ofDiscount/Premium, 2020 | 57,919
Principal/Net ofDiscount/Premium, 2021 | 126,532
Principal/Net ofDiscount/Premium, 2022 | 40,617
Principal/Net ofDiscount/Premium, Thereafter | 726,350
Principal/Net ofDiscount/Premium, Total | $ 1,037,911

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