Long-Term Debt - Additional Information (Detail)
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3 Months Ended |
12 Months Ended |
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May. 09, 2013
USD ($)
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Jul. 02, 2012
USD ($)
shares
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Dec. 31, 2015
USD ($)
shares
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Sep. 30, 2015
USD ($)
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Jun. 30, 2015
USD ($)
Agreement
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Mar. 31, 2015
USD ($)
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Dec. 31, 2014
USD ($)
shares
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Sep. 30, 2014
USD ($)
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Jun. 30, 2014
USD ($)
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Mar. 31, 2014
USD ($)
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Dec. 31, 2015
USD ($)
$ / shares
shares
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Dec. 31, 2014
USD ($)
shares
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Dec. 31, 2013
USD ($)
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| Debt Instrument [Line Items] |
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| Retained earnings |
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$ 457,010,000
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$ 376,353,000
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$ 457,010,000
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$ 376,353,000
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| Net income (loss) |
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$ 31,058,000
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$ 26,505,000
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$ 14,781,000
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$ 13,967,000
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26,126,000
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$ 24,712,000
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$ 26,993,000
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$ 19,386,000
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$ 86,311,000
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97,217,000
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$ 81,618,000
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| Convertible senior notes due |
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2029
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| Minimum EBTDAR to rent ratio |
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381.00%
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381.00%
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| Notional Forward | Agreement |
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4
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| Incremental interest expense |
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$ 7,800,000
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10,700,000
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$ 11,800,000
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| Net expense expected to be reclassified |
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$ 3,200,000
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3,200,000
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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 |
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10,000,000
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11,100,000
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10,000,000
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11,100,000
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| Benefits and charges related to cash flow swaps not designated as hedges |
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600,000
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500,000
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$ 900,000
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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 |
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5,100,000
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8,200,000
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5,100,000
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8,200,000
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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 |
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$ 4,900,000
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3,500,000
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$ 4,900,000
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3,500,000
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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 |
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$ 600,000
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$ 600,000
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| Assumed Notes [Member] |
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| Debt Instrument [Line Items] |
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| Stated interest rate on debt agreement |
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5.35%
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5.35%
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| Premium recorded on notes payable |
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$ 7,300,000
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$ 7,300,000
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| Outstanding principal balance |
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800,000
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$ 800,000
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| Notes payable due date |
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August 2016
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| Mortgage Notes [Member] |
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| Debt Instrument [Line Items] |
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| Outstanding principal balance |
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$ 319,400,000
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$ 319,400,000
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| Notes payable due date |
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Between 2016 and 2033
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| Debt weighted average interest rate on note |
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3.74%
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3.74%
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| Mortgage financing aggregate |
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$ 69,100,000
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$ 69,100,000
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| Percentage of operating locations related to mortgage financing |
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37.00%
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| Required Ratio [Member] |
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| Debt Instrument [Line Items] |
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| Minimum EBTDAR to rent ratio |
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150.00%
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150.00%
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| Common Class A [Member] |
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| Debt Instrument [Line Items] |
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| Common stock, shares issued | shares |
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62,586,381
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62,046,966
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62,586,381
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62,046,966
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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 |
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Aug. 15, 2019
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| Retained earnings |
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$ 0
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$ 0
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| Net income (loss) |
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$ 0
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| Minimum EBTDAR to rent ratio |
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381.00%
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381.00%
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| 2014 Credit Facility [Member] | Required Ratio [Member] |
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| Debt Instrument [Line Items] |
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| Minimum EBTDAR to rent ratio |
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150.00%
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150.00%
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| 2014 Revolving Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Current borrowing capacity |
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$ 225,000,000
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$ 225,000,000
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| Maximum borrowing capacity |
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275,000,000
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275,000,000
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| Borrowing base |
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208,200,000
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208,200,000
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| Letters of credit outstanding amount |
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22,900,000
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22,900,000
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| 2014 Revolving Credit Facility |
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4,203,000
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4,203,000
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| Borrowing availability amount |
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181,100,000
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181,100,000
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| 2014 Floor Plan Facilities [Member] |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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800,000,000
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800,000,000
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| Increase in credit facility borrowing capacity |
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1,000,000,000
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$ 1,000,000,000
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| 2014 Used Vehicle Floor Plan Facility [Member] |
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| Debt Instrument [Line Items] |
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| Allocation of credit facility increase, percentage |
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20.00%
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| 7.0% Senior Subordinated Notes Due 2022 [Member] |
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| Debt Instrument [Line Items] |
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| Retained earnings |
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$ 0
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$ 0
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| Net income (loss) |
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$ 0
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| Principal amount |
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$ 200,000,000
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| Stated interest rate on debt agreement |
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7.00%
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7.00%
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7.00%
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7.00%
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7.00%
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| Notes issued at a price of principal amount |
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99.11%
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| Notes issued yield maturity, percentage |
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7.125%
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| Notes maturity date |
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Jul. 15, 2022
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| Interest payable description |
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semi-annually in arrears on January 15 and July 15 of each year
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| Notes redemption price percentage of the par value due to change of control |
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101.00%
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| Debt instrument maximum allowed dividends per share | $ / shares |
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$ 0.10
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| Restrictive covenants under 2011 credit facilities and 7 % notes with 5% notes |
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Specifically, the indenture governing Sonic’s 7.0% Notes limits Sonic’s ability to pay quarterly cash dividends on Sonic’s Class A and Class B common stock in excess of $0.10 per share. Sonic may only pay quarterly cash dividends on Sonic’s Class A and Class B common stock if Sonic complies with the terms of the indenture governing the 7.0%
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| Outstanding principal amount of the 7.0% notes |
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25.00%
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| 7.0% Senior Subordinated Notes Due 2022 [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Indebtedness with outstanding balance under other agreements |
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$ 35,000,000
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| 5.0% Senior Subordinated Notes due 2023 [Member] |
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| Debt Instrument [Line Items] |
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| Retained earnings |
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$ 0
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0
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| Net income (loss) |
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$ 0
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| Principal amount |
$ 300,000,000
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| Stated interest rate on debt agreement |
5.00%
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5.00%
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5.00%
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5.00%
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5.00%
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| Notes issued at a price of principal amount |
100.00%
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| Notes maturity date |
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May 15, 2023
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| Interest payable description |
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semi-annually in arrears on May 15 and November 15 of each year
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| Notes redemption price percentage of the par value due to change of control |
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101.00%
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| Debt instrument maximum allowed dividends per share | $ / shares |
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$ 0.10
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| Restrictive covenants under 2011 credit facilities and 7 % notes with 5% notes |
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Specifically, the indenture governing Sonic’s 5.0% Notes limits Sonic’s ability to pay quarterly cash dividends on Sonic’s Class A and Class B common stock in excess of $0.10 per share. Sonic may only pay quarterly cash dividends on Sonic’s Class A and Class B common stock if Sonic complies with the terms of the indenture governing the 5.0% Notes.
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| Outstanding principal amount of the 7.0% notes |
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25.00%
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| Notes redeemed percentage of aggregate principal amount |
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35.00%
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| Notes redemption price percentage of the par value |
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105.00%
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| Notes redemption price percentage of the principal amount |
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100.00%
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| 5.0% Senior Subordinated Notes due 2023 [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Indebtedness with outstanding balance under other agreements |
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$ 50,000,000
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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 | shares |
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4,100,000
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| 9.0% Senior Subordinated Notes due 2018 [Member] |
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| Debt Instrument [Line Items] |
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| Stated interest rate on debt agreement |
9.00%
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| Convertible senior notes due |
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2018
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