Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information
6 Months Ended
Jun. 30, 2013
Jul. 18, 2013
Common Class A
Jul. 18, 2013
Common Class B
Entity Registrant Name SONIC AUTOMOTIVE INC    
Entity Central Index Key 0001043509    
Document Type 10-Q    
Document Period End Date Jun. 30, 2013    
Amendment Flag false    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus Q2    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   40,767,025 12,029,375