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Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Interim Reporting [Line Items]                      
Net revenues $ 305,505 $ 306,286 $ 304,872 $ 266,238 $ 288,239 $ 296,701 $ 293,345 $ 255,202 $ 1,182,901 $ 1,133,487 $ 1,092,291
Net revenues less direct advertising expenses 199,306 202,441 199,801 162,815 184,996 193,501 190,287 155,651      
Net (loss) income applicable to common stock 7,127 11,405 13,831 (22,907) 6,280 3,901 11,335 (13,331) 9,456 8,185 (40,467)
Net (loss) income                 9,821 8,550 (40,102)
Net (loss) income per common share basic $ 0.08 $ 0.12 $ 0.15 $ (0.25) $ 0.07 $ 0.04 $ 0.12 $ (0.14) $ 0.10 $ 0.09 $ (0.44)
Net (loss) income per common share - diluted $ 0.08 $ 0.12 $ 0.15 $ (0.25) $ 0.07 $ 0.04 $ 0.12 $ (0.14) $ 0.10 $ 0.09 $ (0.44)
LAMAR MEDIA CORP [Member]
                      
Interim Reporting [Line Items]                      
Net revenues 305,505 306,286 304,872 266,238 288,239 296,701 293,345 255,202 1,182,901 1,133,487 1,092,291
Net revenues less direct advertising expenses 199,306 202,441 199,801 162,815 184,996 193,501 190,287 155,651      
Net (loss) income $ 7,294 $ 11,585 $ 13,992 $ (22,825) $ 6,225 $ 4,115 $ 11,436 $ (13,164) $ 10,046 $ 8,612 $ (40,198)