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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Subsequent Event [Member] |
Subsequent Events (Textual) [Abstract] |
Shares repurchase of Class A common stock | $ 100.0
Total remaining repurchase authorization | $ 49.6

X
- Definition Stock repurchase program additional authorized amount. + References No definition available. + Details
Name: | sah_StockRepurchaseProgramAdditionalAuthorizedAmount
Namespace Prefix: | sah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration