XML 60 R48.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Long-Term Debt - Summary of Interest Received and Paid under Term of Cash Flow Swap (Parenthetical) (Detail) | 6 Months Ended
--- | ---
Jun. 30, 2017
Derivatives, Fair Value [Line Items] |
One-month LIBOR rate | 1.224%
Receive Rate | one-month LIBOR
Cash Flow Swap 5 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 03, 2017
Cash Flow Swap 9 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 01, 2017
Cash Flow Swap 15 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 01, 2017
Cash Flow Swap 10 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 02, 2018
Cash Flow Swap 11 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 02, 2018
Cash Flow Swap 13 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 02, 2018
Cash Flow Swap 12 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 01, 2019
Cash Flow Swap 14 [Member] |
Derivatives, Fair Value [Line Items] |
Receive Rate | one-month LIBOR
Swap agreement effective date | Jul. 01, 2019

X
- Definition Derivative instrument description of variable rate. + References No definition available. + Details
Name: | sah_DerivativeInstrumentDescriptionOfVariableRate
Namespace Prefix: | sah_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeInceptionDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Variable interest rate in effect as of the balance sheet date related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeVariableInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=sah_CashFlowSwapFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=sah_CashFlowSwapNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=sah_CashFlowSwapFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=sah_CashFlowSwapTenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=sah_CashFlowSwapElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=sah_CashFlowSwapThirteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=sah_CashFlowSwapTwelveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=sah_CashFlowSwapFourteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |