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Commitments and Contingencies - Summary of Lease Exit Accruals (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Lease Exit [Roll Forward] |
Balance at December 31, 2017 | $ 6,478
Lease exit expense | 2,697
Payments | (2,336)
Lease buyout/other | (580)
Balance at September 30, 2018 | 6,259
Component of lease exit expense in selling, general and administrative expenses | 2,300
Component of lease exit expense in interest expense | 100
Component of lease exit expense in income (loss) from operations and the sale of dealerships before tax | 300
Component of lease exit payments in selling, general and administrative expenses | 800
Component of lease exit payments in income (loss) from operations and the sale of dealerships before tax | $ 1,500

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- Definition Lease Buyout and Other + References No definition available. + Details
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Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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- References No definition available. + Details
Name: | sah_LeaseExitExpense
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | sah_LeaseExitExpenseInterestExpense
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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- References No definition available. + Details
Name: | sah_LeaseExitPaymentDiscontinuedOperations
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | sah_LeaseExitPaymentSellingGeneralAndAdministrative
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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