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Per Share Data and Stockholders' Equity - Dilutive Effect on Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Earnings Per Share [Abstract] |  |
Weighted Average Shares, Earning (loss) and shares | 50,854 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 52,418 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted Average Shares, Stock compensation plans | 549 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 528 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted Average Shares, Diluted earnings (loss) and shares | 51,403 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,946 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income (Loss) From Continuing Operations, Amount | $ 14,389 us-gaap_IncomeLossFromContinuingOperations | $ 19,984 us-gaap_IncomeLossFromContinuingOperations
Participating securities income (loss) from continuing operations non-vested restricted stock and restricted stock units | (5)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (63)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Income (Loss) From Continuing Operations, Basic | 14,384 sah_IncomeLossFromContinuingOperationsBasicAfterEffectOfParticipatingSecurities | 19,921 sah_IncomeLossFromContinuingOperationsBasicAfterEffectOfParticipatingSecurities
Income (Loss) From Continuing Operations Diluted, Amount | 14,384 sah_IncomeLossFromContinuingOperationsDiluted | 19,921 sah_IncomeLossFromContinuingOperationsDiluted
Income (Loss) From Continuing Operations, Basic earnings (loss), Per Share Amount | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.38 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (Loss) From Continuing Operations, Diluted earnings (loss), Per Share Amount | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.38 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Dilutive effect on earnings per share | (422)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (598)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount | (422)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxBasicAfterEffectOfParticipatingSecurities | (598)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxBasicAfterEffectOfParticipatingSecurities
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Amount | (422)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntityDiluted | (598)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntityDiluted
Income (Loss) From Discontinuing Operations, Basic earnings (loss), Per Share Amount | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Per Share Amount | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net Income (Loss), Amount | 13,967 us-gaap_NetIncomeLoss | 19,386 us-gaap_NetIncomeLoss
Net Income (Loss), Basic, Amount | 13,962 sah_NetIncomeLossBasicAfterEffectOfParticipatingSecurities | 19,323 sah_NetIncomeLossBasicAfterEffectOfParticipatingSecurities
Net Income (Loss), Diluted, Amount | $ 13,962 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 19,323 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Net Income (Loss), Basic, Per Share Amount | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic
Net Income (Loss), Diluted, Per Share Amount | $ 0.27 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted

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