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Long-Term Debt - Summary of Interest Received and Paid under Term of Cash Flow Swap (Detail) (USD $)
In Millions, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2014
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Jun. 30, 2014
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| Derivatives, Fair Value [Line Items] |
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| Receive Rate |
One-month LIBOR
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| Variable Interest Rate |
0.17%us-gaap_DerivativeVariableInterestRate
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| Cash Flow Swap [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
$ 2.7us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapMember
|
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| Pay Rate |
7.10%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapMember
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| Receive Rate |
one-month LIBOR + 1.50%
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| Maturing Date |
Jul. 10, 2017
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| Variable Interest Rate |
1.50%us-gaap_DerivativeVariableInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapMember
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| Cash Flow Swap 1 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
8.6us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapOneMember
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| Pay Rate |
4.655%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapOneMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Dec. 10, 2017
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| Cash Flow Swap 2 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
7.4us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapTwoMember
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| Pay Rate |
6.86%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapTwoMember
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| Receive Rate |
one-month LIBOR + 1.25%
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| Maturing Date |
Aug. 01, 2017
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| Variable Interest Rate |
1.25%us-gaap_DerivativeVariableInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapTwoMember
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| Cash Flow Swap 3 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
100.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapThreeMember
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| Pay Rate |
3.28%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapThreeMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jul. 01, 2015
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| Cash Flow Swap 4 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
100.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFourMember
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| Pay Rate |
3.30%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFourMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jul. 01, 2015
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| Cash Flow Swap 5 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
6.4us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFiveMember
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| Pay Rate |
6.41%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFiveMember
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| Receive Rate |
one-month LIBOR + 1.25%
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| Maturing Date |
Sep. 12, 2017
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| Variable Interest Rate |
1.25%us-gaap_DerivativeVariableInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFiveMember
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| Cash Flow Swap 6 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
50.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapSixMember
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| Pay Rate |
3.24%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapSixMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jul. 01, 2015
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| Cash Flow Swap 7 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
50.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapSevenMember
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| Pay Rate |
3.07%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapSevenMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jul. 01, 2015
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| Cash Flow Swap 8 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
100.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapEightMember
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| Pay Rate |
2.065%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapEightMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jun. 30, 2017
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| Cash Flow Swap 9 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
100.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapNineMember
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| Pay Rate |
2.015%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapNineMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jun. 30, 2017
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| Cash Flow Swap 10 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
200.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapTenMember
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| Pay Rate |
0.788%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapTenMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jul. 01, 2016
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| Cash Flow Swap 11 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
50.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapElevenMember
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| Pay Rate |
1.32%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapElevenMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jul. 01, 2017
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| Cash Flow Swap 12 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
250.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapTwelveMember
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| Pay Rate |
1.887%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapTwelveMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jun. 30, 2018
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| Cash Flow Swap 13 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
25.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapThirteenMember
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25.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapThirteenMember
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| Pay Rate |
2.08%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapThirteenMember
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jul. 01, 2017
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| Cash Flow Swap 14 [Member] |
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| Derivatives, Fair Value [Line Items] |
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| Notional Amount |
$ 100.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFourteenMember
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$ 100.0us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFourteenMember
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| Pay Rate |
1.56%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFourteenMember
|
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| Receive Rate |
one-month LIBOR
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| Maturing Date |
Jul. 01, 2017
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