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Long-term Debt - Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long Term Debt $ 1,938,802 $ 2,160,854
Less current maturities (55,935) (33,134)
Long-term debt excluding current maturities 1,882,867 2,127,720
LAMAR MEDIA CORP [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 1,938,802 2,160,854
Less current maturities (55,935) (33,134)
Long-term debt excluding current maturities 1,882,867 2,127,720
Senior Credit Facility [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 502,106 384,664
Senior Credit Facility [Member] | LAMAR MEDIA CORP [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 502,106 384,664
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
5 7/8% Senior Subordinated Notes [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 500,000 500,000
5 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 500,000 500,000
5% Senior Subordinated Notes [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 535,000 535,000
5% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 535,000 535,000
9 3/4% Senior Notes [Member]
   
Debt Instrument [Line Items]    
Long Term Debt   339,121
9 3/4% Senior Notes [Member] | LAMAR MEDIA CORP [Member]
   
Debt Instrument [Line Items]    
Long Term Debt   339,121
Other notes with various rates and terms [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 1,696 2,069
Other notes with various rates and terms [Member] | LAMAR MEDIA CORP [Member]
   
Debt Instrument [Line Items]    
Long Term Debt $ 1,696 $ 2,069