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Summarized Financial Information of Subsidiaries (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Jun. 30, 2012
9 3/4% Senior Notes [Member]
Jun. 30, 2011
9 3/4% Senior Notes [Member]
Mar. 27, 2009
9 3/4% Senior Notes [Member]
Debt Instrument [Line Items]              
Interest rate on senior notes 6.625%       9.75% 9.75% 9.75%
Summarized Financial Information of Subsidiaries (Textual) [Abstract]              
Balance of permitted transfers to parent company   $ 1,648,103 $ 1,641,856        
Description of provisions on senior credit facility transfers to Lamar Advertising subject to additional restrictions   the total holdings debt ratio is greater than 5.75 to 1 or its senior debt ratio is greater than 3.25 to 1.0, or if under the indenture for Lamar Media’s 9 3/4% senior notes and as defined therein, its senior leverage ratio is greater than or equal to 3.0 to 1          
Description of actual position on senior credit facility transfers to Lamar Advertising not subject to additional restrictions   (i) the total holdings debt ratio was less than 5.75 to 1 (ii) the senior debt ratio was less than 3.25 to 1 and (iii) the senior leverage ratio was less than 3.0 to 1 related under senior credit facility or the 9 3/4% senior notes          
Holdings debt ratio   5.75          
Senior debt ratio   3.25          
Senior leverage ratio   3.0          
Holdings debt ratio related to actual position on senior credit facility       5.75      
Senior debt ratio related to actual position on senior credit facility       3.25      
Senior leverage ratio related to actual position on senior credit facility       3.0