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Summary of Significant Accounting Policies - Summary of Lease Exit Accruals (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2016 USD ($)
Accounting Policies [Abstract] |
Beginning balance | $ 14,527
Interest expense, net of adjustments | (139)
Payments | (3,163)
Ending balance | $ 11,225

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- Definition Lease exit accruals. + 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 interest expense net of adjustments. + References No definition available. + Details
Name: | sah_LeaseExitInterestExpenseNetOfAdjustments
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lease exit payment. + 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: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration