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Business Acquisitions and Dispositions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2015
Franchise
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Mar. 31, 2014
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| Business Acquisition [Line Items] | ||
| Number of franchise acquired | 0us-gaap_NumberOfBusinessesAcquired | |
| Aggregate purchase price of franchise | $ 2.6us-gaap_BusinessCombinationConsiderationTransferred1 | |
| Luxury Franchise [Member] | ||
| Business Acquisition [Line Items] | ||
| Number of franchise acquired |
1us-gaap_NumberOfBusinessesAcquired / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = sah_LuxuryFranchiseMember |
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of businesses acquired by the entity during the period. No definition available.
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| X | ||||||||||
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- Details
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