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Summarized Financial Information of Subsidiaries - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
Balance of permitted transfers to parent company $ 2,072,542 $ 1,706,875
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; therefore, transfers to Lamar Advertising were not subject to any additional restrictions under the senior credit facility.  
Holdings debt ratio 5.75  
Senior debt ratio 3.25  
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.  
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