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Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2014 Agreement | Dec. 31, 2013 | Jun. 30, 2014 Cash Flow Swap Thirteen | Jun. 30, 2014 Cash Flow Swap Fourteen | Sep. 30, 2014 Assumed Notes [Member] | Sep. 30, 2014 7.0% Senior Subordinated Notes Due 2022 [Member] | Dec. 31, 2013 7.0% Senior Subordinated Notes Due 2022 [Member] | Sep. 30, 2014 Subordinated Notes [Member] | Jul. 02, 2012 Subordinated Notes [Member] | Sep. 30, 2014 5.0% Senior Subordinated Notes due 2023 [Member] | Dec. 31, 2013 5.0% Senior Subordinated Notes due 2023 [Member] | Sep. 30, 2014 Mortgage Notes [Member] | Sep. 30, 2014 Derivative Instruments and Hedging Activities [Member] | Sep. 30, 2013 Derivative Instruments and Hedging Activities [Member] | Sep. 30, 2014 Derivative Instruments and Hedging Activities [Member] | Sep. 30, 2013 Derivative Instruments and Hedging Activities [Member] | Dec. 31, 2013 Derivative Instruments and Hedging Activities [Member] | Sep. 30, 2014 Derivative Instruments and Hedging Activities [Member] Other Long-Term Liabilities [Member] | Dec. 31, 2013 Derivative Instruments and Hedging Activities [Member] Other Long-Term Liabilities [Member] | Sep. 30, 2014 Derivative Instruments and Hedging Activities [Member] Other Accrued Liabilities [Member] | Dec. 31, 2013 Derivative Instruments and Hedging Activities [Member] Other Accrued Liabilities [Member] | Sep. 30, 2014 Derivative Instruments and Hedging Activities [Member] Other Assets [Member] | Dec. 31, 2013 Derivative Instruments and Hedging Activities [Member] Other Assets [Member] | Sep. 30, 2014 2011 Credit Facility [Member] | Sep. 30, 2014 2011 Revolving Credit Facility [Member] | Sep. 30, 2014 2011 New Vehicle Floor Plan Facility [Member] 2011 Used Vehicle Floor Plan Facility [Member] | Sep. 30, 2014 2014 Credit Facility [Member] | Sep. 30, 2014 2014 Credit Facility [Member] Maximum [Member] | Sep. 30, 2014 2014 Credit Facility [Member] Minimum [Member] | Sep. 30, 2014 2014 Credit Facility [Member] Required Ratio [Member] Maximum [Member] | Sep. 30, 2014 2014 Credit Facility [Member] Required Ratio [Member] Minimum [Member] | Sep. 30, 2014 2014 Revolving Credit Facility [Member] | Sep. 30, 2014 2014 Revolving Credit Facility [Member] Two Thousand Fourteen New Vehicle Floor Plan Facility | Sep. 30, 2014 2014 Used Vehicle Floor Plan Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of revolving credit facility and floor plan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 15, 2016 |  |  | Aug. 15, 2019 |  |  |  |  |  |  |
Increased borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |  |  | $ 225,000,000 |  |
Increased borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 605,000,000 |  |  |  |  |  | 275,000,000 |  | 800,000,000
Borrowing base |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 144,200,000 |  |
Letters of credit outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,200,000 |  |
Total debt | 783,481,000 |  | 783,481,000 |  |  | 748,373,000 |  |  | 5,200,000 | 200,000,000 | 200,000,000 |  |  | 300,000,000 | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,800,000 |  |
Borrowing availability amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,200,000 |  |
Increase in credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |
Allocation of credit facility increase, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Principal amount |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on notes | 5.00% |  | 5.00% |  |  |  |  |  | 5.35% | 7.00% | 7.00% |  |  | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued at a price of principal amount |  |  | 100.00% |  |  |  |  |  |  |  |  | 99.11% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued yield maturity, percentage |  |  |  |  |  |  |  |  |  |  |  |  | 7.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes maturity date |  |  | May 15, 2023 |  |  |  |  |  |  | Jul. 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 107.00% |  |  |  | 105.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 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% |  |  |  | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount of the 7.0% notes |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness with outstanding balance |  |  |  |  |  |  |  |  |  | 35,000,000 |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium recorded on notes payable |  |  |  |  |  |  |  |  | 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium associated with notes |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable due date |  |  |  |  |  |  |  |  | October 2015 and August 2016 |  |  |  |  |  |  | between 2015 and 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt weighted average interest rate on note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.76% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage financing aggregate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 265,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of dealership properties related to mortgage financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBTDAR to rent ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.56 | 1.00 | 1.50 | 1.00 |  |  |
Fair value of swap positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,600,000 |  | 10,600,000 |  | 16,300,000 |  |  | 9,300,000 | 11,600,000 | 2,000,000 | 3,700,000 |  |  |  |  |  |  |  |  |  |  |
Fair value of swap positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,300,000 | 8,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Forward |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of interest rate cash flow swap agreements |  |  | swap agreements become effective in July 2016 and July 2015, respectively, and terminate in July 2017. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate Cash flow swap agreements |  |  |  |  |  |  | 25,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefits and charges related to cash flow swaps not designated as hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 100,000 | 400,000 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental interest expense | 2,400,000 | 3,000,000 | 8,300,000 | 8,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net expense expected to be reclassified | $ 5,800,000 |  | $ 5,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Minimum amount of outstanding indebtedness the entity or its subsidiaries must have under other agreements in order to allow an acceleration of the entity's debt obligation if certain events of default occur. + 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 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 Percentage of mortgage dealership properties. + 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 Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + 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 210.5-02.22) -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 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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