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Document and Entity Information
 6 Months Ended
Jun. 30, 2012
Aug. 01, 2012
Entity Registrant Name LAMAR ADVERTISING CO/NEW  
Entity Central Index Key 0001090425  
Document Type 10-Q  
Document Period End Date Jun. 30, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
LAMAR MEDIA CORP. AND SUBSIDIARIES
    
Entity Registrant Name LAMAR MEDIA CORP/DE  
Entity Central Index Key 0000899045  
Document Type 10-Q  
Document Period End Date Jun. 30, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   100
Common Class A
    
Entity Common Stock, Shares Outstanding   78,447,313
Common Class B
    
Entity Common Stock, Shares Outstanding   14,910,365