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Goodwill and Other Intangible Assets - Summary of Changes in Gross Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Goodwill And Intangible Assets [Line Items]  
Goodwill, Beginning balance $ 1,680,483
Goodwill acquired during the year 60,968
Purchase price adjustments and other (2,765)
Goodwill, ending balance 1,738,686
LAMAR MEDIA CORP [Member]
  
Goodwill And Intangible Assets [Line Items]  
Goodwill, Beginning balance 1,669,462
Goodwill acquired during the year 60,968
Purchase price adjustments and other (2,765)
Impairment losses   
Goodwill, ending balance $ 1,727,665