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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts $ 7,615 $ 7,500
Accumulated amortization 25,867 28,187
Shares held in treasury 17,119,205 17,082,652
Series AA Preferred Stock [Member]
    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, cumulative dividends $ 63.80 $ 63.80
Preferred stock, shares authorized 5,720 5,720
Preferred stock, shares issued 5,720 5,720
Preferred stock, shares outstanding 5,720 5,720
Preferred Class A [Member]
    
Preferred stock, par value $ 638 $ 638
Preferred stock, cumulative dividends $ 63.80 $ 63.80
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common Class A [Member]
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 175,000,000 175,000,000
Common stock, shares issued 96,082,868 95,011,499
Common stock, shares outstanding 78,963,663 77,928,847
Common Class B [Member]
    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 37,500,000 37,500,000
Common stock, shares issued 14,910,365 15,122,865
Common stock, shares outstanding 14,910,365 15,122,865
LAMAR MEDIA CORP [Member]
    
Allowance for doubtful accounts 7,615 7,500
Accumulated amortization $ 16,579 $ 18,899
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 3,000 3,000
Common stock, shares issued 100 100
Common stock, shares outstanding 100 100