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Related Party Transactions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]    
Deferred gains $ 85 $ 941
Receivables from employees 57 230
Annual consulting fee 190  
Annual consulting fee for renewal 150  
Amended consulting agreement period 5 years  
Consulting agreement renewal period 1 year  
Termination Date Sep. 30, 2012  
Consulting Fees Paid 112  
Interest owned in service contract 26.66%  
Aggregate amount payable under the service contract 1,328  
LAMAR MEDIA CORP [Member]
    
Related Party Transaction [Line Items]    
Amount payable to parent company 8,356 9,400
Amount contributed to affiliate $ 26,839 $ 16,553