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Summarized Financial Information of Subsidiaries - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
9 3/4% Senior Notes [Member]
Dec. 31, 2011
9 3/4% Senior Notes [Member]
Mar. 27, 2009
9 3/4% Senior Notes [Member]
Debt Instrument [Line Items]            
Interest rate stated on notes     2.875% 9.75% 9.75% 9.75%
Balance of permitted transfers to parent company $ 1,706,875 $ 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 (y) the senior debt ratio is greater than 3.25 to 1.0, and (ii) 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 The total holdings debt ratio was less than 5.75 to 1 and Lamar Media's senior debt ratio was less than 3.25 to 1 and its senior leverage ratio was less than 3.0 to 1; therefore, transfers to Lamar Advertising were not subject to any additional restrictions under the senior credit facility or pursuant to the indenture governing 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