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Fair Value Measurements - Fair Value and Carrying Value of Fixed Rate Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Carrying Value | $ 773,412 us-gaap_LongTermDebt |
7.0% Senior Subordinated Notes Due 2022 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Fair Value | 216,000 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember | 218,000 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
Long-term Debt, Carrying Value | 198,556 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember | 198,414 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
5.0% Senior Subordinated Notes due 2023 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Fair Value | 294,000 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember | 285,000 us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
Long-term Debt, Carrying Value | 300,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember | 300,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
Mortgage Loan at Fix Interest Rate [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Fair Value | 152,240 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = sah_MortgageLoanAtFixInterestRateMember | 165,381 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = sah_MortgageLoanAtFixInterestRateMember
Long-term Debt, Carrying Value | 147,554 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = sah_MortgageLoanAtFixInterestRateMember | 157,571 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = sah_MortgageLoanAtFixInterestRateMember
Assumed Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Fair Value | 4,365 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = sah_AssumedNotesMember | 7,636 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = sah_AssumedNotesMember
Long-term Debt, Carrying Value | 4,474 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = sah_AssumedNotesMember | 7,993 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = sah_AssumedNotesMember
Other [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Fair Value | 4,588 us-gaap_LongTermDebtFairValue / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember | 4,774 us-gaap_LongTermDebtFairValue / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember
Long-term Debt, Carrying Value | $ 4,884 us-gaap_LongTermDebt / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember | $ 5,080 us-gaap_LongTermDebt / us-gaap_DebtSecurityAxis = us-gaap_OtherDebtSecuritiesMember

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |