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Long-Term Debt (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 Agreement | Jun. 30, 2012 | Jun. 30, 2013 Agreement | Jun. 30, 2012 | Dec. 31, 2012
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Receive Rate |  |  | one-month LIBOR |  |
Premium associated with notes | $ 500,000 |  | $ 500,000 |  | $ 700,000
Incremental interest expense | 2,900,000 | 2,500,000 | 5,800,000 | 6,900,000 |
One-month LIBOR rate | 0.195% |  | 0.195% |  |
Notional forward | 3 |  | 3 |  |
Duration of Interest rate cash flow swap agreements |  |  | swap agreements become effective in July 2015, July 2016 and July 2017, respectively, and terminate in July 2016, July 2017 and June 2018, respectively. |  |
Net expense expected to be reclassified | 7,400,000 |  | 7,400,000 |  |
Outstanding principal amount of the 7.0% Notes |  |  | 25.00% |  |
Remaining unamortized premium balance | 500,000 |  | 500,000 |  | 700,000
Loss on Extinguishment of Notes |  |  | (28,235,000) | (2,578,000) |
Incremental Interest expense | 14,390,000 | 13,835,000 | 28,749,000 | 30,244,000 |
Swap agreement effective date |  |  | Jul. 01, 2015 |  |
Cash Flow Swap 13 [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Receive Rate |  |  | one-month LIBOR |  |
Interest rate cash flow swap agreements | 200,000,000 |  | 200,000,000 |  |
Interest rate cash flow swap agreements maturing date |  |  | Jul. 01, 2016 |  |
Cash Flow Swap 14 [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Receive Rate |  |  | one-month LIBOR |  |
Interest rate cash flow swap agreements | 50,000,000 |  | 50,000,000 |  |
Interest rate cash flow swap agreements maturing date |  |  | Jul. 01, 2017 |  |
Swap agreement effective date |  |  | Jul. 01, 2016 |  |
Cash Flow Swap 15 [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Receive Rate |  |  | one-month LIBOR |  |
Interest rate cash flow swap agreements | 250,000,000 |  | 250,000,000 |  |
Interest rate cash flow swap agreements maturing date |  |  | Jun. 30, 2018 |  |
Swap agreement effective date |  |  | Jul. 03, 2017 |  |
9.0% Senior Subordinate Notes due 2018 [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest on notes | 9.00% |  | 9.00% |  |
Discount associated with notes |  |  |  |  | 1,100,000
Unsecured senior subordinated obligations, description |  |  | 9.0% Notes |  |
Loss on Extinguishment of Notes |  |  | 28,200,000 |  |
Repayment Of Cash to Repurchase 9.0% Notes |  |  | 237,200,000 |  |
Incremental Interest expense |  |  | 800,000 |  |
7.0% Senior Subordinated Notes due 2022 [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest on notes | 7.00% |  | 7.00% |  |
Discount associated with notes | 1,700,000 |  | 1,700,000 |  | 1,700,000
5.0% Senior Subordinated Notes due 2023 [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest on notes | 5.00% |  | 5.00% |  |
Notes Issued at a Price of principal Amount |  |  | 100.00% |  |
Notes maturity date |  |  | May 15, 2023 |  |
Principal amount | 300,000,000 |  | 300,000,000 |  |
Interest payable description |  |  | semi-annually in arrears on May 15 and November 15 of each year |  |
Notes redeemed percentage of aggregate principal amount |  |  | 35.00% |  |
Notes redemption price percentage of the principal amount |  |  | 100.00% |  |
Notes redemption price percentage of the par value |  |  | 105.00% |  |
Notes redemption price percentage of the par value due to change of control |  |  | 101.00% |  |
Debt instrument maximum allowed dividends per share |  |  | $ 0.10 |  |
Outstanding principal amount of the 7.0% Notes |  |  | 25.00% |  |
Indebtedness with outstanding balance |  |  | 50,000,000 |  |
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 |  |
Debt Default Description under 5% and 7% Notes |  |  | Sonic’s obligations under the 5.0% Notes may be accelerated by the holders of 25% of the outstanding principal amount of the 5.0% Notes then outstanding if certain events of default occur, including: (1) defaults in the payment of principal or interest when due; (2) defaults in the performance, or breach, of Sonic’s covenants under the 5.0% Notes; and (3) certain defaults under other agreements under which Sonic or its subsidiaries have outstanding indebtedness in excess of $50.0 million. |  |
Senior Subordinated Notes [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest on notes | 7.00% |  | 7.00% |  |
Notes maturity date |  |  | Jul. 15, 2022 |  |
Interest payable description |  |  | Semi-annually in arrears on January 15 and July 15 of each year |  |
Notes redeemed percentage of aggregate principal amount |  |  | 35.00% |  |
Notes redemption price percentage of the principal amount |  |  | 100.00% |  |
Notes redemption price percentage of the par value |  |  | 107.00% |  |
Notes redemption price percentage of the par value due to change of control |  |  | 101.00% |  |
Debt instrument maximum allowed dividends per share |  |  | $ 0.10 |  |
Indebtedness with outstanding balance |  |  | 35,000,000 |  |
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% Notes. |  |
Debt Default Description under 5% and 7% Notes |  |  | Sonic’s obligations under the 7.0% Notes may be accelerated by the holders of 25% of the outstanding principal amount of the 7.0% Notes then outstanding if certain events of default occur, including: (1) defaults in the payment of principal or interest when due; (2) defaults in the performance, or breach, of Sonic’s covenants under the 7.0% Notes; and (3) certain defaults under other agreements under which Sonic or its subsidiaries have outstanding indebtedness in excess of $35.0 million. |  |
Mortgage Notes Payable [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Discount associated with notes | 600,000 |  | 600,000 |  | 700,000
Mortgage Notes [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Debt weighted average interest rate on note | 4.10% |  | 4.10% |  |
Mortgage financing aggregate | 220,900,000 |  | 220,900,000 |  |
Mortgage financing related to dealership properties |  |  | 23 |  |
Notes payable due date |  |  | between August 2014 and March 2031 |  |
Derivative Instruments and Hedging Activities [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Fair value of swap positions | 20,700,000 |  | 20,700,000 |  | 34,300,000
Derivative Instruments and Hedging Activities [Member] | Other accrued liabilities [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Fair value of swap positions | 11,900,000 |  | 11,900,000 |  | 12,100,000
Derivative Instruments and Hedging Activities [Member] | Other long-term liabilities [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Fair value of swap positions | 12,800,000 |  | 12,800,000 |  | 22,200,000
Derivative Instruments and Hedging Activities [Member] | Other Assets [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Fair value of swap positions included in other assets | 4,000,000 |  | 4,000,000 |  |
Maximum [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest on notes | 10.52% |  | 10.52% |  |
Maximum [Member] | Mortgage Loan at Fix Interest Rate [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest on notes | 7.03% |  | 7.03% |  |
Maximum [Member] | Mortgage Loan at Variable Interest Rate [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
One-month LIBOR rate | 3.50% |  | 3.50% |  |
Minimum [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest on notes | 9.52% |  | 9.52% |  |
Minimum [Member] | Mortgage Loan at Fix Interest Rate [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest on notes | 3.51% |  | 3.51% |  |
Minimum [Member] | Mortgage Loan at Variable Interest Rate [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
One-month LIBOR rate | 1.25% |  | 1.25% |  |
Weighted Average [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest on notes | 10.19% |  | 10.19% |  |
2011 Revolving Credit Facility [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Interest rate | 2.00% |  | 2.00% |  | 2.25%
2011 Credit facility, Amendment, Number of Common Stock Pledged As Collateral, Reductions | 5,000,000 |  | 5,000,000 |  |
Increased Borrowing Capacity | 225,000,000 |  | 225,000,000 |  |
Borrowing Base | 139,300,000 |  | 139,300,000 |  |
Letters of credit outstanding amount | 32,300,000 |  | 32,300,000 |  |
Borrowing Availability Amount | 107,000,000 |  | 107,000,000 |  |
2011 Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Increased Borrowing Capacity | 175,000,000 |  | 175,000,000 |  |
2011 Credit Facility [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Maturity date of 2011 Revolving credit facility and Floor plan facility |  |  | Aug. 15, 2016 |  |
Credit facilities amendment date |  |  | Mar. 14, 2013 |  |
2011 Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
EBTDAR to rent ratio | 3.36 |  | 3.36 |  |
2011 Credit Facility [Member] | Maximum [Member] | Required ratio [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
EBTDAR to rent ratio | 1.50 |  | 1.50 |  |
2011 Credit Facility [Member] | Minimum [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
EBTDAR to rent ratio | 1.00 |  | 1.00 |  |
2011 Credit Facility [Member] | Minimum [Member] | Required ratio [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
EBTDAR to rent ratio | 1.00 |  | 1.00 |  |
Common Class A [Member] |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Estimated fair value of common stock issued | $ 615,000 |  | $ 615,000 |  | $ 614,000
Estimated fair value of common stock issued per share | $ 0.01 |  | $ 0.01 |  | $ 0.01

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