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Long-term Debt - Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Long Term Debt $ 2,160,854 $ 2,158,528
Less current maturities (33,134) (17,310)
Long-term debt excluding current maturities 2,127,720 2,141,218
LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 2,160,854 2,158,528
Less current maturities (33,134) (17,310)
Long-term debt excluding current maturities 2,127,720 2,141,218
Senior Credit Agreement [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 384,664 595,477
Senior Credit Agreement [Member] | LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 384,664 595,477
7 7/8% Senior Subordinated Notes [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 400,000 400,000
7 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 400,000 400,000
6 5/8% Senior Subordinated Notes [Member]
    
Debt Instrument [Line Items]    
Long Term Debt    381,290
Long-term debt excluding current maturities 0  
6 5/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt   381,290
6 5/8% Senior Subordinated Notes - Series B [Member]
    
Debt Instrument [Line Items]    
Long Term Debt    191,544
6 5/8% Senior Subordinated Notes - Series B [Member] | LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt   191,544
6 5/8% Senior Subordinated Notes - Series C [Member]
    
Debt Instrument [Line Items]    
Long Term Debt    256,040
6 5/8% Senior Subordinated Notes - Series C [Member] | LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt   256,040
5 7/8% Senior Subordinated Notes [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 500,000  
5 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 500,000  
5% Senior Subordinated Notes [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 535,000  
5% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 535,000  
9 3/4% Senior Notes [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 339,121 331,553
9 3/4% Senior Notes [Member] | LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 339,121 331,553
Other notes with various rates and terms [Member]
    
Debt Instrument [Line Items]    
Long Term Debt 2,069 2,624
Other notes with various rates and terms [Member] | LAMAR MEDIA CORP [Member]
    
Debt Instrument [Line Items]    
Long Term Debt $ 2,069 $ 2,624