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Capital Structure and Per Share Data - Dilutive Effect on Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted Average Shares, Earning (loss) and shares |  |  |  |  |  |  |  |  | 52,065 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 52,556 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 53,550 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted Average Shares, Contingently convertible debt |  |  |  |  |  |  |  |  |  |  | 6,411 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Weighted Average Shares, Stock compensation plans |  |  |  |  |  |  |  |  | 498 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 385 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 445 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted Average Shares, Diluted earnings (loss) and shares |  |  |  |  |  |  |  |  | 52,563 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,941 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 60,406 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income (Loss) From Continuing Operations, Amount |  |  |  |  |  |  |  |  | $ 98,559 us-gaap_IncomeLossFromContinuingOperations | $ 84,678 us-gaap_IncomeLossFromContinuingOperations | $ 91,261 us-gaap_IncomeLossFromContinuingOperations
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units |  |  |  |  |  |  |  |  | (311)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (601)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (1,381)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Income (Loss) From Continuing Operations, Basic |  |  |  |  |  |  |  |  | 98,248 sah_IncomeLossFromContinuingOperationsBasicAfterEffectOfParticipatingSecurities | 84,077 sah_IncomeLossFromContinuingOperationsBasicAfterEffectOfParticipatingSecurities | 89,880 sah_IncomeLossFromContinuingOperationsBasicAfterEffectOfParticipatingSecurities
Income (Loss) From Continuing Operations, Contingently convertible debt, Amount |  |  |  |  |  |  |  |  |  |  | 4,617 sah_InterestOnConvertibleDebtNetOfTaxContinuingOperations
Income (Loss) From Continuing Operations Diluted, Amount |  |  |  |  |  |  |  |  | 98,248 sah_IncomeLossFromContinuingOperationsDiluted | 84,077 sah_IncomeLossFromContinuingOperationsDiluted | 94,497 sah_IncomeLossFromContinuingOperationsDiluted
Income (Loss) From Continuing Operations, Basic earnings (loss), Per Share Amount |  |  |  |  |  |  |  |  | $ 1.89 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.60 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.68 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (Loss) From Continuing Operations, Diluted earnings (loss), Per Share Amount |  |  |  |  |  |  |  |  | $ 1.87 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.59 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.56 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Dilutive effect on earnings per share |  |  |  |  |  |  |  |  | (1,342)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (3,060)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (2,160)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount |  |  |  |  |  |  |  |  | (1,342)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxBasicAfterEffectOfParticipatingSecurities | (3,060)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxBasicAfterEffectOfParticipatingSecurities | (2,160)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxBasicAfterEffectOfParticipatingSecurities
Income (Loss) From Discontinued Operations, Contingently convertible debt, Amount |  |  |  |  |  |  |  |  |  |  | 64 sah_InterestOnConvertibleDebtNetOfTaxDiscontinuedOperations
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Amount |  |  |  |  |  |  |  |  | (1,342)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntityDiluted | (3,060)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntityDiluted | (2,096)sah_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntityDiluted
Income (Loss) From Discontinuing Operations, Basic earnings (loss), Per Share Amount |  |  |  |  |  |  |  |  | $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.06)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.04)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Per Share Amount |  |  |  |  |  |  |  |  | $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.06)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net Income (Loss), Amount | 26,126 us-gaap_NetIncomeLoss | 24,712 us-gaap_NetIncomeLoss | 26,993 us-gaap_NetIncomeLoss | 19,386 us-gaap_NetIncomeLoss | 28,084 us-gaap_NetIncomeLoss | 23,327 us-gaap_NetIncomeLoss | 8,916 us-gaap_NetIncomeLoss | 21,291 us-gaap_NetIncomeLoss | 97,217 us-gaap_NetIncomeLoss | 81,618 us-gaap_NetIncomeLoss | 89,101 us-gaap_NetIncomeLoss
Net Income (Loss), Basic, Amount |  |  |  |  |  |  |  |  | 96,906 sah_NetIncomeLossBasicAfterEffectOfParticipatingSecurities | 81,017 sah_NetIncomeLossBasicAfterEffectOfParticipatingSecurities | 87,720 sah_NetIncomeLossBasicAfterEffectOfParticipatingSecurities
Net Income (Loss), Contingently convertible debt, Amount |  |  |  |  |  |  |  |  |  |  | 4,681 us-gaap_InterestOnConvertibleDebtNetOfTax
Net Income (Loss), Diluted, Amount |  |  |  |  |  |  |  |  | $ 96,906 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 81,017 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 92,401 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Net Income (Loss), Basic, Per Share Amount | $ 0.51 us-gaap_EarningsPerShareBasic | $ 0.47 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.44 us-gaap_EarningsPerShareBasic | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic | $ 1.86 us-gaap_EarningsPerShareBasic | $ 1.54 us-gaap_EarningsPerShareBasic | $ 1.64 us-gaap_EarningsPerShareBasic
Net Income (Loss), Diluted, Per Share Amount | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 0.47 us-gaap_EarningsPerShareDiluted | $ 0.51 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.44 us-gaap_EarningsPerShareDiluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted | $ 1.84 us-gaap_EarningsPerShareDiluted | $ 1.53 us-gaap_EarningsPerShareDiluted | $ 1.53 us-gaap_EarningsPerShareDiluted

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