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v2.4.1.9

Segment Information - Summary of Reportable Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
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 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues | $ 2,351,828 us-gaap_Revenues | $ 2,355,604 us-gaap_Revenues | $ 2,353,280 us-gaap_Revenues | $ 2,136,387 us-gaap_Revenues | $ 2,315,369 us-gaap_Revenues | $ 2,242,197 us-gaap_Revenues | $ 2,202,436 us-gaap_Revenues | $ 2,083,166 us-gaap_Revenues | $ 9,197,099 us-gaap_Revenues | $ 8,843,168 us-gaap_Revenues | $ 8,365,468 us-gaap_Revenues |
Total segment income |  |  |  |  |  |  |  |  | 214,820 sah_SegmentReportingIncomeLoss | 212,649 sah_SegmentReportingIncomeLoss | 220,948 sah_SegmentReportingIncomeLoss |
Interest expense, other, net |  |  |  |  |  |  |  |  | (53,190)us-gaap_InterestExpenseOther | (55,485)us-gaap_InterestExpenseOther | (60,090)us-gaap_InterestExpenseOther |
Other income (expense), net |  |  |  |  |  |  |  |  | 97 us-gaap_OtherNonoperatingIncomeExpense | (28,143)us-gaap_OtherNonoperatingIncomeExpense | (19,625)us-gaap_OtherNonoperatingIncomeExpense |
Income (loss) from continuing operations before taxes |  |  |  |  |  |  |  |  | 161,727 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 129,021 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 141,233 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Total floorplan interest expense |  |  |  |  |  |  |  |  | 18,793 sah_FloorPlanInterestExpense | 21,954 sah_FloorPlanInterestExpense | 19,454 sah_FloorPlanInterestExpense |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 58,260 us-gaap_DepreciationAndAmortization | 54,007 us-gaap_DepreciationAndAmortization | 45,285 us-gaap_DepreciationAndAmortization |
Total capital expenditures |  |  |  |  |  |  |  |  | 146,432 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 157,617 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 95,376 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
Total assets | 3,183,135 us-gaap_Assets |  |  |  | 3,051,170 us-gaap_Assets |  |  |  | 3,183,135 us-gaap_Assets | 3,051,170 us-gaap_Assets |  |
Cash and cash equivalents | 4,182 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | 3,016 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | 4,182 us-gaap_CashAndCashEquivalentsAtCarryingValue | 3,016 us-gaap_CashAndCashEquivalentsAtCarryingValue | 3,371 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,913 us-gaap_CashAndCashEquivalentsAtCarryingValue
Goodwill, Net | 475,929 us-gaap_Goodwill |  |  |  | 476,315 us-gaap_Goodwill |  |  |  | 475,929 us-gaap_Goodwill | 476,315 us-gaap_Goodwill | 454,224 us-gaap_Goodwill |
Other Intangible Assets, net | 83,720 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  | 87,866 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  | 83,720 us-gaap_IntangibleAssetsNetExcludingGoodwill | 87,866 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |
Other Corporate and other assets | 735,227 us-gaap_OtherAssets |  |  |  | 600,870 us-gaap_OtherAssets |  |  |  | 735,227 us-gaap_OtherAssets | 600,870 us-gaap_OtherAssets |  |
Franchised Dealerships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  | 9,191,661 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 8,843,168 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 8,365,468 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember |
Total segment income |  |  |  |  |  |  |  |  | 230,733 sah_SegmentReportingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 218,139 sah_SegmentReportingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 221,721 sah_SegmentReportingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember |
Total floorplan interest expense |  |  |  |  |  |  |  |  | 18,727 sah_FloorPlanInterestExpense / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 21,954 sah_FloorPlanInterestExpense / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 19,454 sah_FloorPlanInterestExpense / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 58,001 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 54,007 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 45,285 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember |
Total capital expenditures |  |  |  |  |  |  |  |  | 117,129 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 151,947 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 95,376 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember |
Total assets | 1,841,962 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember |  |  |  | 1,877,433 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember |  |  |  | 1,841,962 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember | 1,877,433 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sah_FranchisedDealershipsMember |  |
Echo Park [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  | 5,438 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember |  |  |
Total segment income |  |  |  |  |  |  |  |  | (15,913)sah_SegmentReportingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember | (5,490)sah_SegmentReportingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember | (773)sah_SegmentReportingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember |
Total floorplan interest expense |  |  |  |  |  |  |  |  | 66 sah_FloorPlanInterestExpense / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 259 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 29,303 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember | 5,670 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember |  |
Total assets | $ 42,115 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember |  |  |  | $ 5,670 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember |  |  |  | $ 42,115 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember | $ 5,670 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = sah_EchoParkMember |  |

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