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Long-Term Debt - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 0 Months Ended | 3 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  | 12 Months Ended |
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Dec. 31, 2013 Note | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Assumed Notes [Member] | Dec. 31, 2013 Common Class A [Member] | Dec. 31, 2012 Common Class A [Member] | Dec. 31, 2013 2011 Revolving Credit Facility [Member] | Dec. 31, 2012 2011 Revolving Credit Facility [Member] | Dec. 31, 2013 2011 Credit Facility [Member] | Dec. 31, 2013 2012 Revolving Credit Facility [Member] | Dec. 31, 2013 2011 New Vehicle Floor Plan Facility [Member] | Dec. 31, 2013 Maximum [Member] 2011 Revolving Credit Facility [Member] | Dec. 31, 2013 Maximum [Member] 2011 Credit Facility [Member] | Dec. 31, 2013 Minimum [Member] 2011 Credit Facility [Member] | Dec. 31, 2013 5.0% Senior Subordinated Notes due 2023 [Member] | May 09, 2013 5.0% Senior Subordinated Notes due 2023 [Member] | Jul. 02, 2012 5.0% Senior Subordinated Notes due 2023 [Member] Common Class A [Member] | Dec. 31, 2013 7.0% Senior Subordinated Notes due 2022 [Member] | Dec. 31, 2012 7.0% Senior Subordinated Notes due 2022 [Member] | Jul. 02, 2012 7.0% Senior Subordinated Notes due 2022 [Member] | Dec. 31, 2013 2011 Used Vehicle Floor Plan Facility [Member] 2011 New Vehicle Floor Plan Facility [Member] | Dec. 31, 2013 2011 Used Vehicle Floor Plan Facility [Member] Maximum [Member] 2011 New Vehicle Floor Plan Facility [Member] | Mar. 12, 2010 9.0% Senior Subordinated Notes due 2018 [Member] | Jun. 30, 2013 9.0% Senior Subordinated Notes due 2018 [Member] | Dec. 31, 2013 9.0% Senior Subordinated Notes due 2018 [Member] | Dec. 31, 2012 9.0% Senior Subordinated Notes due 2018 [Member] | Dec. 31, 2013 Senior Subordinated Notes [Member] | Jul. 02, 2012 Senior Subordinated Notes [Member] | Dec. 31, 2013 Mortgage Notes [Member] Property | Dec. 31, 2013 Derivative Instruments and Hedging Activities [Member] | Dec. 31, 2012 Derivative Instruments and Hedging Activities [Member] | Dec. 31, 2011 Derivative Instruments and Hedging Activities [Member] | Dec. 31, 2013 Derivative Instruments and Hedging Activities [Member] Other Accrued Liabilities [Member] | Dec. 31, 2012 Derivative Instruments and Hedging Activities [Member] Other Accrued Liabilities [Member] | Dec. 31, 2013 Derivative Instruments and Hedging Activities [Member] Other Assets [Member] | Dec. 31, 2013 Derivative Instruments and Hedging Activities [Member] Other Long-Term Liabilities [Member] | Dec. 31, 2012 Derivative Instruments and Hedging Activities [Member] Other Long-Term Liabilities [Member] | Dec. 31, 2013 Required Ratio [Member] Maximum [Member] 2011 Credit Facility [Member] | Dec. 31, 2013 Required Ratio [Member] Minimum [Member] 2011 Credit Facility [Member] | Dec. 31, 2013 5.0% Convertible Senior Note due 2029 [Member] | Dec. 31, 2012 5.0% Convertible Senior Note due 2029 [Member] | Dec. 31, 2011 5.0% Convertible Senior Note due 2029 [Member] | Sep. 23, 2009 5.0% Convertible Senior Note due 2029 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of 2011 revolving credit facility and floor plan facility |  |  |  |  |  |  |  |  | Aug. 15, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased borrowing capacity |  |  |  |  |  |  | $ 225,000,000 |  |  |  |  | $ 175,000,000 |  |  |  |  |  |  |  |  | $ 605,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing base |  |  |  |  |  |  |  |  |  | 158,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding amount |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
9.0% convertible notes | 748,373,000 | 629,385,000 |  | 7,600,000 |  |  | 32,000,000 | 6,176,000 |  |  |  |  |  |  | 300,000,000 |  |  | 200,000,000 | 200,000,000 |  |  |  | 210,000,000 |  |  | 210,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing availability amount |  |  |  |  |  |  | 126,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of credit facility increase, percentage |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 15, 2023 |  |  | Jul. 15, 2022 |  |  |  |  | Mar. 15, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2029 |  |  |
Interest on notes |  | 5.00% | 5.00% | 5.35% |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  | 7.00% | 7.00% |  |  |  | 9.00% | 9.00% | 9.00% | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Repayment of cash to repurchase 9.0% notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 237,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,900,000 | 900,000 |
Incremental interest expense | 55,485,000 | 60,090,000 | 66,857,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |
Unsecured senior subordinated obligations, description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.0% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 172,500,000
Notes issued at a price of principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  | 99.11% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued yield maturity, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 61,584,248 | 61,352,134 |  |  |  |  |  |  |  |  |  |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of first required payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 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. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes redemption price percentage of the principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased aggregate principal amount in convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,400,000 |
Tax benefit related to extinguishment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,200,000 |  |  |
Number of notes payable | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable due date |  |  |  | October 2015 and August 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Between 2014 and 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium recorded on notes payable |  |  |  | 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining unamortized premium balance |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt weighted average interest rate on note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.09% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage financing aggregate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 237,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage financing related to dealership properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBTDAR to rent ratio |  |  |  |  |  |  |  |  |  |  |  |  | 3.59 | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50 | 1.00 |  |  |  |
Fair value of swap positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,300,000 | 34,300,000 |  | 11,600,000 | 12,100,000 |  | 8,400,000 | 22,200,000 |  |  |  |  |  |
Fair value of swap positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |
Benefits and charges related to Cash flow swaps not designated as hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (900,000) | (700,000) | 800,000 |  |  |  |  |  |  |  |  |  |  |
Incremental interest expense | 11,800,000 | 13,400,000 | 17,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net expense expected to be reclassified | $ 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Certain benefits and charges included in interest expense, other, net, in the Consolidated Statements of Income for the cash flow swaps not designated as hedges and amortization of amounts in accumulated other comprehensive income (loss) related to terminated cash flow swaps. + References No definition available. + Details
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- Definition Maximum amount per share the entity may pay as quarterly cash dividends on common stock as permitted by the indenture governing the entity's debt obligation. + References No definition available. + Details
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- Definition Aggregate principal amount of the total notes, as a percentage, that the entity may redeem on or before a set date. + References No definition available. + Details
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- Definition Premium recorded for notes payable assumed by the entity in connection with a prior year acquisition. + References No definition available. + Details
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- Definition EBTDAR to rent ratio. + References No definition available. + Details
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- Definition The maximum amount of an increase in the Floor Plan Facilities that the entity may, under certain conditions, request, which shall be allocated between the New Vehicle Floor Plan Facility and the Used Vehicle Floor Plan Facility. + References No definition available. + Details
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- Definition As a total of the principal notes amount, the percentage for which the notes were issued. + References No definition available. + Details
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- Definition The total number of notes payable assumed by the entity in connection with a prior year acquisition. + References No definition available. + Details
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- Definition Availability under the an entity's credit facility calculated as the lesser of a specified flate amount or a borrowing base calculated based on certain eligible assets, less the aggregate face amount of any outstanding letters of credit under the Credit Facility. + References No definition available. + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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