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Income Taxes - Income Tax Expense (Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]      
U.S. federal, Current      $ (1,290)
State and local, Current 823 1,075 477
Foreign, Current 1,103 1,847 1,932
Total Current 1,926 2,922 1,119
U.S. federal, Deferred 7,977 2,963 (14,174)
State and local, Deferred 826 1,125 (3,767)
Foreign, Deferred (1,253) (387) (6,647)
Total, Deferred 7,550 3,702 (24,588)
U.S. federal, Total 7,977 2,963 (15,464)
State and local, Total 1,649 2,200 (3,290)
Foreign, Total (150) 1,460 (4,715)
Income tax expense (benefit) 9,476 6,623 (23,469)
LAMAR MEDIA CORP [Member]
      
Income Taxes [Line Items]      
U.S. federal, Current     (1,290)
State and local, Current 824 1,075 529
Foreign, Current 1,103 1,847 1,932
Total Current 1,927 2,922 1,171
U.S. federal, Deferred 8,093 3,088 (14,130)
State and local, Deferred 820 1,295 (3,607)
Foreign, Deferred (1,253) (386) (6,647)
Total, Deferred 7,660 3,997 (24,384)
U.S. federal, Total 8,093 3,088 (15,420)
State and local, Total 1,644 2,370 (3,078)
Foreign, Total (150) 1,461 (4,715)
Income tax expense (benefit) $ 9,587 $ 6,919 $ (23,213)