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Property and Equipment (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Property and Equipment (Textual) [Abstract] |  |  |  |
Capital Expenditure, Additions, During the period | $ 29.8 | $ 22.5 | $ 89.1 | $ 34.5

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- Details
Name: | sah_PropertyAndEquipmentTextualAbstract
Namespace Prefix: | sah_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration