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Business Acquisitions and Dispositions - Summary of Consolidated Pro Forma Results of Future Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |
Total revenues | $ 9,324,013 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 9,000,959 us-gaap_BusinessAcquisitionsProFormaRevenue
Gross profit | 1,382,600 sah_BusinessAcquisitionsProFormaGrossProfit | 1,322,044 sah_BusinessAcquisitionsProFormaGrossProfit
Income from continuing operations before taxes | 164,493 sah_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeTax | 131,594 sah_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeTax
Net income from continuing operations | $ 100,245 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 86,367 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Diluted earnings per share from continuing operations | $ 1.90 sah_BusinessAcquisitionProFormaEarningsPerShareBasicAndDilutedFromContinuingOperation | $ 1.62 sah_BusinessAcquisitionProFormaEarningsPerShareBasicAndDilutedFromContinuingOperation

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- Definition Business acquisitions pro forma gross profit. + References No definition available. + Details
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- Definition Business acquisitions pro forma income loss from continuing operations before tax. + References No definition available. + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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