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Long-Term Debt - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Jun. 30, 2014
Agreement
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Jul. 02, 2012
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| Debt Instrument [Line Items] |
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| Total debt |
$ 773,412,000us-gaap_DebtInstrumentCarryingAmount
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$ 748,373,000us-gaap_DebtInstrumentCarryingAmount
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| Stated interest rate on debt agreement |
5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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| Notional Forward |
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2sah_NumberOfNewForwardStartingCashFlowSwapAgreements
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| Description of interest rate cash flow swap agreements |
swap agreements become effective in July 2016 and July 2015, respectively, and terminate in July 2017.
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| Incremental interest expense |
10,700,000sah_InterestExpenseNetCashFlowSwaps
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11,800,000sah_InterestExpenseNetCashFlowSwaps
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13,400,000sah_InterestExpenseNetCashFlowSwaps
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| Net expense expected to be reclassified |
5,100,000us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
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| Cash Flow Swap 13 [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate Cash flow swap agreements |
25,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapThirteenMember
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25,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapThirteenMember
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| Swap agreement effective date |
2016-07
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| Swap agreement maturity date |
2017-07
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| Cash Flow Swap 14 [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate Cash flow swap agreements |
100,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFourteenMember
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100,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sah_CashFlowSwapFourteenMember
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| Swap agreement effective date |
2015-07
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| Swap agreement maturity date |
2017-07
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| Common Class A [Member] |
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| Debt Instrument [Line Items] |
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| Common stock, shares issued |
62,046,966us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
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61,584,248us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
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| 2014 Revolving Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Increased borrowing capacity |
225,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= sah_TwoThousandFourteenRevolvingCreditFacilityMember
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| Increased borrowing capacity |
275,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= sah_TwoThousandFourteenRevolvingCreditFacilityMember
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| Borrowing base |
194,800,000sah_RevolvingBorrowingBase
/ us-gaap_LongtermDebtTypeAxis
= sah_TwoThousandFourteenRevolvingCreditFacilityMember
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| Letters of credit outstanding amount |
29,200,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= sah_TwoThousandFourteenRevolvingCreditFacilityMember
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| Total debt |
0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= sah_TwoThousandFourteenRevolvingCreditFacilityMember
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| Borrowing availability amount |
165,600,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= sah_TwoThousandFourteenRevolvingCreditFacilityMember
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| Allocation of credit facility increase, percentage |
20.00%sah_MaximumAllocableBorrowingCapacityIncreasePercentage
/ us-gaap_LongtermDebtTypeAxis
= sah_TwoThousandFourteenRevolvingCreditFacilityMember
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| 7.0% Senior Subordinated Notes Due 2022 [Member] |
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| Debt Instrument [Line Items] |
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| Principal amount |
200,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
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| Stated interest rate on debt agreement |
7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
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7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
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| Notes maturity date |
Jul. 15, 2022
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| Interest payable description |
semi-annually in arrears on January 15 and July 15 of each year
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| Notes redeemed percentage of aggregate principal amount |
35.00%sah_DebtInstrumentPercentageOfMaximumRedemptionWithCashFromCommonStockOffering
/ us-gaap_LongtermDebtTypeAxis
= sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
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| Notes redemption price percentage of the par value |
107.00%sah_NotesRedemptionPricePercentageOfParValue
/ us-gaap_LongtermDebtTypeAxis
= sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
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| Notes redemption price percentage of the par value due to change of control |
101.00%sah_NotesRedemptionPricePercentageOfParValueDueToChangeOfControl
/ us-gaap_LongtermDebtTypeAxis
= sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
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| Debt instrument maximum allowed dividends per share |
$ 0.10sah_DebtInstrumentMaximumAllowedDividendsPerShare
/ us-gaap_LongtermDebtTypeAxis
= sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
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| Restrictive covenants under 2011 credit facilities and 7 % notes with 5% notes |
Specifically, the indenture governing Sonic’s 7.0% Notes limits Sonic’s ability to pay quarterly cash dividends on Sonic’s Class A and B common stock in excess of $0.10 per share. Sonic may only pay quarterly cash dividends on Sonic’s Class A and B common stock if Sonic complies with the terms of the indenture governing the 7.0%
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| Outstanding principal amount of the 7.0% notes |
25.00%sah_DebtInstrumentPercentageOfOutstandingPrincipalAmountRedeemableUponEventOfDefault
/ us-gaap_LongtermDebtTypeAxis
= sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
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| 7.0% Senior Subordinated Notes Due 2022 [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Indebtedness with outstanding balance under other agreements |
35,000,000sah_DebtInstrumentOtherOutstandingIndebtednessInExcess
/ us-gaap_LongtermDebtTypeAxis
= sah_SevenPercentSeniorSubordinateNoteDueTwoThousandTwentyTwoMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Subordinated Notes [Member] |
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| Debt Instrument [Line Items] |
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| Notes issued at a price of principal amount |
99.11%sah_NotesIssuedAtPriceOfPrincipalAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
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| Notes issued yield maturity, percentage |
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7.125%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
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| 5.0% Senior Subordinated Notes due 2023 [Member] |
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| Debt Instrument [Line Items] |
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| Principal amount |
300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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| Stated interest rate on debt agreement |
5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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| Notes issued at a price of principal amount |
100.00%sah_NotesIssuedAtPriceOfPrincipalAmount
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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| Notes maturity date |
May 15, 2023
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| Interest payable description |
semi-annually in arrears on May 15 and November 15 of each year
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| Notes redeemed percentage of aggregate principal amount |
35.00%sah_DebtInstrumentPercentageOfMaximumRedemptionWithCashFromCommonStockOffering
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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| Notes redemption price percentage of the par value |
105.00%sah_NotesRedemptionPricePercentageOfParValue
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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| Notes redemption price percentage of the par value due to change of control |
101.00%sah_NotesRedemptionPricePercentageOfParValueDueToChangeOfControl
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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| Debt instrument maximum allowed dividends per share |
$ 0.10sah_DebtInstrumentMaximumAllowedDividendsPerShare
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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| Restrictive covenants under 2011 credit facilities and 7 % notes with 5% notes |
Specifically, the indenture governing Sonic’s 5.0% Notes limits Sonic’s ability to pay quarterly cash dividends on Sonic’s Class A and B common stock in excess of $0.10 per share. Sonic may only pay quarterly cash dividends on Sonic’s Class A and B common stock if Sonic complies with the terms of the indenture governing the 5.0% Notes
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| Outstanding principal amount of the 7.0% notes |
25.00%sah_DebtInstrumentPercentageOfOutstandingPrincipalAmountRedeemableUponEventOfDefault
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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| Notes redemption price percentage of the principal amount |
100.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
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| 5.0% Senior Subordinated Notes due 2023 [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Indebtedness with outstanding balance under other agreements |
50,000,000sah_DebtInstrumentOtherOutstandingIndebtednessInExcess
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| 5.0% Senior Subordinated Notes due 2023 [Member] | Common Class A [Member] |
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| Debt Instrument [Line Items] |
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| Common stock, shares issued |
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4,100,000us-gaap_CommonStockSharesIssued
/ us-gaap_LongtermDebtTypeAxis
= sah_FivePercentSeniorSubordinateNoteDueTwoThousandTwentyThreeMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
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| Assumed Notes [Member] |
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| Debt Instrument [Line Items] |
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| Total debt |
4,400,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= sah_AssumedNotesMember
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| Stated interest rate on debt agreement |
5.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sah_AssumedNotesMember
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| Premium recorded on notes payable |
7,300,000sah_DebtInstrumentsFairValueDisclosurePremiumRecorded
/ us-gaap_LongtermDebtTypeAxis
= sah_AssumedNotesMember
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| Premium associated with notes |
100,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_LongtermDebtTypeAxis
= sah_AssumedNotesMember
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| Notes payable due date |
October 2015 and August 2016
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| Mortgage Notes [Member] |
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| Debt Instrument [Line Items] |
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| Total debt |
265,900,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= sah_MortgageNotesMember
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| Notes payable due date |
between 2015 and 2033
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| Debt weighted average interest rate on note |
3.74%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= sah_MortgageNotesMember
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| Mortgage financing aggregate |
44,400,000us-gaap_SecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= sah_MortgageNotesMember
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| Percentage of dealership properties related to mortgage financing |
30.00%sah_PercentageOfMortgageDealershipProperties
/ us-gaap_LongtermDebtTypeAxis
= sah_MortgageNotesMember
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| Actual Ratio [Member] |
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| Debt Instrument [Line Items] |
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| Minimum EBTDAR to rent ratio |
3.56sah_MinimumEbtdarToRentRatio
/ us-gaap_LongtermDebtTypeAxis
= sah_ActualRatioMember
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| Required Ratio [Member] |
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| Debt Instrument [Line Items] |
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| Minimum EBTDAR to rent ratio |
1.50sah_MinimumEbtdarToRentRatio
/ us-gaap_LongtermDebtTypeAxis
= sah_RequiredRatioMember
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| Derivative Instruments and Hedging Activities [Member] |
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| Debt Instrument [Line Items] |
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| Fair value of swap positions |
11,100,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
|
16,300,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
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| Benefits and charges related to cash flow swaps not designated as hedges |
500,000sah_CashFlowSwapsNotDesignatedAsHedgeBenefitsAndCharges
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
|
900,000sah_CashFlowSwapsNotDesignatedAsHedgeBenefitsAndCharges
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
|
700,000sah_CashFlowSwapsNotDesignatedAsHedgeBenefitsAndCharges
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
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| Derivative Instruments and Hedging Activities [Member] | Other Accrued Liabilities [Member] |
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| Debt Instrument [Line Items] |
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| Fair value of swap positions |
8,200,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= sah_OtherAccruedLiabilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
|
11,600,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= sah_OtherAccruedLiabilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
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| Derivative Instruments and Hedging Activities [Member] | Other Long-Term Liabilities [Member] |
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| Debt Instrument [Line Items] |
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| Fair value of swap positions |
3,500,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= sah_OtherLongTermLiabilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
|
8,400,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= sah_OtherLongTermLiabilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
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| Derivative Instruments and Hedging Activities [Member] | Other Assets [Member] |
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| Debt Instrument [Line Items] |
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| Fair value of swap positions |
600,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
|
3,700,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_LongtermDebtTypeAxis
= sah_DerivativeInstrumentsAndHedgingActivitiesMember
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| 2011 Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Maturity date of revolving credit facility and floor plan facility |
Aug. 15, 2016
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| 2011 Revolving Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Increased borrowing capacity |
175,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= sah_TwoThousandElevenRevolvingCreditFacilityMember
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| 2011 New Used Vehicle Floor Plan Facility [Member] |
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| Debt Instrument [Line Items] |
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| Increased borrowing capacity |
605,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= sah_TwoThousandElevenNewUsedVehicleFloorPlanFacilityMember
|
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| 2014 Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Maturity date of revolving credit facility and floor plan facility |
Aug. 15, 2019
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| 2014 Credit Facility [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
|
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| EBTDAR to rent ratio |
1.00sah_EbtdarToRentRatio
/ us-gaap_CreditFacilityAxis
= sah_TwoThousandFourteenCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
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| 2014 Credit Facility [Member] | Actual Ratio [Member] |
|
|
|
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| Debt Instrument [Line Items] |
|
|
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|
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| Minimum EBTDAR to rent ratio |
3.56sah_MinimumEbtdarToRentRatio
/ us-gaap_CreditFacilityAxis
= sah_TwoThousandFourteenCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sah_ActualRatioMember
|
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| 2014 Credit Facility [Member] | Required Ratio [Member] |
|
|
|
|
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| Debt Instrument [Line Items] |
|
|
|
|
|
| Minimum EBTDAR to rent ratio |
1.50sah_MinimumEbtdarToRentRatio
/ us-gaap_CreditFacilityAxis
= sah_TwoThousandFourteenCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sah_RequiredRatioMember
|
|
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| 2014 Credit Facility [Member] | Required Ratio [Member] | Minimum [Member] |
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
| EBTDAR to rent ratio |
1.00sah_EbtdarToRentRatio
/ us-gaap_CreditFacilityAxis
= sah_TwoThousandFourteenCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sah_RequiredRatioMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
|
|
|
|
| 2014 Used Vehicle Floor Plan Facility [Member] |
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
| Increased borrowing capacity |
800,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= sah_TwoThousandFourteenUsedVehicleFloorPlanFacilityMember
|
|
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| 2014 New Vehicle Floor Plan Facility [Member] | 2014 Revolving Credit Facility [Member] |
|
|
|
|
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| Debt Instrument [Line Items] |
|
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| Increase in credit facility borrowing capacity |
$ 1,000,000,000sah_LineOfCreditFacilityCombinedIncreaseInBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= sah_TwoThousandFourteenNewVehicleFloorPlanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= sah_TwoThousandFourteenRevolvingCreditFacilityMember
|
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