Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v3.3.1.900
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Feb. 22, 2016
Jun. 30, 2015
Document and Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Trading Symbol SAH    
Entity Registrant Name SONIC AUTOMOTIVE INC    
Entity Central Index Key 0001043509    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 901.7
Common Class A [Member]      
Document and Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   34,010,864  
Common Class B [Member]      
Document and Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   12,029,375