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Commitments and Contingencies - Summary of Lease Exit Accruals (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Lease Exit [Roll Forward] |
Balance at December 31, 2018 | $ 4,634
Effect of adoption of ASC 842, “Leases” | (4,634)
Balance at March 31, 2019 | $ 0

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- Definition Lease Exit Accrual, Effect Of Adoption Of New Accounting Pronouncement + References No definition available. + Details
Name: | sah_LeaseExitAccrualEffectOfAdoptionOfNewAccountingPronouncement
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | sah_LeaseExitAccruals
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lease Exit [Roll Forward] + References No definition available. + Details
Name: | sah_LeaseExitRollForward
Namespace Prefix: | sah_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration