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Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 3 Months Ended |  |  | 9 Months Ended |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  |
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Sep. 30, 2013 | Jun. 30, 2013 Agreement | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 5.0% Senior Subordinated Notes due 2023 [Member] | Dec. 31, 2012 5.0% Senior Subordinated Notes due 2023 [Member] | Sep. 30, 2013 7.0% Senior Subordinated Notes due 2022 [Member] | Dec. 31, 2012 7.0% Senior Subordinated Notes due 2022 [Member] | Jun. 30, 2013 9.0% Senior Subordinated Notes due 2018 [Member] | Sep. 30, 2013 9.0% Senior Subordinated Notes due 2018 [Member] | Dec. 31, 2012 9.0% Senior Subordinated Notes due 2018 [Member] | Sep. 30, 2013 Mortgage Notes [Member] Property | Sep. 30, 2013 Derivative Instruments and Hedging Activities [Member] | Dec. 31, 2012 Derivative Instruments and Hedging Activities [Member] | Sep. 30, 2013 2011 Used Vehicle Floor Plan Facility [Member] | Sep. 30, 2013 Other Accrued Liabilities [Member] Derivative Instruments and Hedging Activities [Member] | Dec. 31, 2012 Other Accrued Liabilities [Member] Derivative Instruments and Hedging Activities [Member] | Sep. 30, 2013 Other Long-Term Liabilities [Member] Derivative Instruments and Hedging Activities [Member] | Dec. 31, 2012 Other Long-Term Liabilities [Member] Derivative Instruments and Hedging Activities [Member] | Sep. 30, 2013 Other Assets [Member] Derivative Instruments and Hedging Activities [Member] | Jun. 30, 2013 Cash Flow Swap 12 [Member] | Sep. 30, 2013 Cash Flow Swap 12 [Member] | Jun. 30, 2013 Cash Flow Swap 13 [Member] | Sep. 30, 2013 Cash Flow Swap 13 [Member] | Jun. 30, 2013 Cash Flow Swap 14 [Member] | Sep. 30, 2013 Cash Flow Swap 14 [Member] | Sep. 30, 2013 2011 Revolving Credit Facility [Member] | Sep. 30, 2013 2011 Revolving Credit Facility [Member] Maximum [Member] | Sep. 30, 2013 2011 Credit Facility [Member] | Sep. 30, 2013 2011 Credit Facility [Member] Maximum [Member] | Sep. 30, 2013 2011 Credit Facility [Member] Maximum [Member] Required Ratio [Member] | Sep. 30, 2013 2011 Credit Facility [Member] Minimum [Member] | Sep. 30, 2013 2011 Credit Facility [Member] Minimum [Member] Required Ratio [Member] | Jul. 31, 2013 2011 New Vehicle Floor Plan Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 Credit facility, amendment, number of common stock pledged as collateral, reductions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Maturity date of 2011 revolving credit facility and floor plan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 15, 2016 |  |  |  |  |
Credit facilities amendment date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 14, 2013 |  |  |  |  |
Increased borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 225,000,000 | $ 175,000,000 |  |  |  |  |  | $ 525,000,000
Borrowing base |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 141,700,000 |  |  |  |  |  |  |
Letters of credit outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,300,000 |  |  |  |  |  |  |
Borrowing availability amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,400,000 |  |  |  |  |  |  |
Limit of borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000
EBTDAR to rent ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.43 | 1.50 | 1.00 | 1.00 |
Interest on notes |  |  |  |  |  | 5.00% | 5.00% | 7.00% | 7.00% | 9.00% | 9.00% | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued at a price of principal amount |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes maturity date |  |  |  |  |  | May 15, 2023 |  | Jul. 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payable description |  |  |  |  |  | Semi-annually in arrears on May 15 and November 15 of each year |  | Semi-annually in arrears on January 15 and July 15 of each year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes redeemed percentage of aggregate principal amount |  |  |  |  |  | 35.00% |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes redemption price percentage of the principal amount |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes redemption price percentage of the par value |  |  |  |  |  | 105.00% |  | 107.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes redemption price percentage of the par value due to change of control |  |  |  |  |  | 101.00% |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maximum allowed dividends per share |  |  |  |  |  | $ 0.10 |  | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount of the 7.0% notes |  |  |  |  |  | 25.00% |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness with outstanding balance |  |  |  |  |  | 50,000,000 |  | 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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. |  | 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. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of cash to repurchase 9.0% notes |  |  |  |  |  |  |  |  |  | 237,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of notes |  |  |  | (28,238,000) | (19,898,000) |  |  |  |  | 28,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental interest expense | 13,553,000 |  | 15,632,000 | 42,302,000 | 45,875,000 |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior subordinated obligations, description |  |  |  |  |  |  |  |  |  | 9.0% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt weighted average interest rate on note |  |  |  |  |  |  |  |  |  |  |  |  | 4.09% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage financing aggregate |  |  |  |  |  |  |  |  |  |  |  |  | 240,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage financing related to dealership properties |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable due date |  |  |  |  |  |  |  |  |  |  |  |  | Between August 2014 and September 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of swap positions |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,300,000 | 34,300,000 |  | 11,600,000 | 12,100,000 | 11,700,000 | 22,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of swap positions included in other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional forward |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate cash flow swap agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 200,000,000 | 50,000,000 | 50,000,000 | 250,000,000 | 250,000,000 |  |  |  |  |  |  |  |
Interest rate cash flow swap agreements maturing date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 01, 2016 | Jul. 01, 2016 | Jul. 01, 2017 | Jul. 01, 2017 | Jun. 30, 2018 | Jun. 30, 2018 |  |  |  |  |  |  |  |
Incremental interest expense | 3,000,000 |  | 3,400,000 | 8,800,000 | 10,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net expense expected to be reclassified | $ 7,200,000 |  |  | $ 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Description of covenants that limit or prohibit certain actions or activities without the lender's prior consent within a specified period of time or until certain specified targets are achieved for example, reduction of the debt or an increase in net worth to a specified amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Discussion of the facts and amounts pertaining to each failure to comply with an affirmative or negative covenant of a long-term debt instrument, including violating payment terms or an inability to meet certain minimum financial requirements or achieve or maintain certain financial ratios. The discussion would generally be expected to also include whether or not the failure can and will be overcome and a description of the terms of any waivers, including the amount of the waiver and the period of time covered by the waiver, and if reclassification of long-term debt to current has been made in the current balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6802200&loc=SL6230698-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(c)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph c -Article 4 + Details
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