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Long-Term Debt - Financial Covenants Include Required Specified Ratios (Detail) | Mar. 31, 2017
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Line Of Credit Facility [Line Items] |
Minimum Consolidated Liquidity Ratio | 117.00%
Minimum Consolidated Fixed Charge Coverage Ratio | 190.00%
Maximum Consolidated Total Lease Adjusted Leverage Ratio | 425.00%
Required Ratio [Member] |
Line Of Credit Facility [Line Items] |
Minimum Consolidated Liquidity Ratio | 105.00%
Minimum Consolidated Fixed Charge Coverage Ratio | 120.00%
Maximum Consolidated Total Lease Adjusted Leverage Ratio | 575.00%

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- Definition Maximum consolidated total lease adjusted leverage ratio. + References No definition available. + Details
Name: | sah_MaximumConsolidatedAggregateLeaseAdjustedLeverageRatio
Namespace Prefix: | sah_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum consolidated fixed charge coverage ratio. + References No definition available. + Details
Name: | sah_MinimumConsolidatedFixedChargeCoverageRatio
Namespace Prefix: | sah_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum consolidated liquidity ratio. + References No definition available. + Details
Name: | sah_MinimumConsolidatedLiquidityRatio
Namespace Prefix: | sah_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=sah_RequiredRatioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |