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Long-Term Debt - Financial Covenants Include Required Specified Ratios (Detail) | Dec. 31, 2014
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Required Ratio [Member] |
Line Of Credit Facility [Line Items] |
Minimum consolidated liquidity ratio | 1.05 sah_MinimumConsolidatedLiquidityRatio / us-gaap_LongtermDebtTypeAxis = sah_RequiredRatioMember
Minimum consolidated fixed charge coverage ratio | 1.20 sah_MinimumConsolidatedFixedChargeCoverageRatio / us-gaap_LongtermDebtTypeAxis = sah_RequiredRatioMember
Maximum consolidated total lease adjusted leverage ratio | 5.50 sah_MaximumConsolidatedAggregateLeaseAdjustedLeverageRatio / us-gaap_LongtermDebtTypeAxis = sah_RequiredRatioMember
Actual Ratio [Member] |
Line Of Credit Facility [Line Items] |
Minimum consolidated liquidity ratio | 1.20 sah_MinimumConsolidatedLiquidityRatio / us-gaap_LongtermDebtTypeAxis = sah_ActualRatioMember
Minimum consolidated fixed charge coverage ratio | 1.61 sah_MinimumConsolidatedFixedChargeCoverageRatio / us-gaap_LongtermDebtTypeAxis = sah_ActualRatioMember
Maximum consolidated total lease adjusted leverage ratio | 4.12 sah_MaximumConsolidatedAggregateLeaseAdjustedLeverageRatio / us-gaap_LongtermDebtTypeAxis = sah_ActualRatioMember

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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: | xbrli:pureItemType
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: | xbrli:pureItemType
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: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- 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_ActualRatioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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