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Business Acquisitions and Dispositions - Assets and Liabilities Classified as Held for Sale (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Assets Held For Sale [Line Items] |  |
Property and equipment, net | $ 8,499 | $ 4,101
Franchise [Member] |  |
Assets Held For Sale [Line Items] |  |
Property and equipment, net | 300 |
Properties Held for Sale [Member] |  |
Assets Held For Sale [Line Items] |  |
Property and equipment, net | $ 8,200 | $ 4,100

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- Details
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Namespace Prefix: | sah_
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- Definition Property, plant and equipment that is held for sale apart from normal operations and anticipated to be sold in less than one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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