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v2.4.1.9

Long-Term Debt - Long-Term Debt (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Stated interest rate on debt agreement | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage |
7.0% Senior Subordinated Notes Due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt agreement | 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember | 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
Discount associated with notes | $ 1.5 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember | $ 1.6 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
5.0% Senior Subordinated Notes due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt agreement | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
Notes Payable to Finance Company [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 10.19%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember |
Premium associated with notes | 0.1 us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember | 0.4 us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
Notes Payable to Finance Company [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt agreement | 9.52%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Notes Payable to Finance Company [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt agreement | 10.52%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
2011 Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = sah_TwoThousandElevenRevolvingCreditFacilityMember |
2014 Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 2.25%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = sah_TwoThousandFourteenRevolvingCreditFacilityMember
Mortgage Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Discount associated with notes | $ 0.4 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = sah_MortgageNotesPayableMember | $ 0.6 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = sah_MortgageNotesPayableMember
Mortgage Loan at Fix Interest Rate [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt agreement | 3.51%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = sah_MortgageLoanAtFixInterestRateMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Mortgage Loan at Fix Interest Rate [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt agreement | 7.03%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = sah_MortgageLoanAtFixInterestRateMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Mortgage Loan at Variable Interest Rate [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt agreement | 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = sah_MortgageLoanAtVariableInterestRateMember |
Mortgage Loan at Variable Interest Rate [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt agreement | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = sah_MortgageLoanAtVariableInterestRateMember |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
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