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Long-term Debt - Long-Term Debt (Parenthetical) (Detail)
Dec. 31, 2010
Dec. 31, 2012
7 7/8% Senior Subordinated Notes [Member]
Apr. 22, 2010
7 7/8% Senior Subordinated Notes [Member]
Dec. 31, 2012
6 5/8% Senior Subordinated Notes [Member]
Aug. 16, 2005
6 5/8% Senior Subordinated Notes [Member]
Dec. 31, 2012
6 5/8% Senior Subordinated Notes - Series B [Member]
Aug. 17, 2006
6 5/8% Senior Subordinated Notes - Series B [Member]
Dec. 31, 2012
6 5/8% Senior Subordinated Notes - Series C [Member]
Oct. 11, 2007
6 5/8% Senior Subordinated Notes - Series C [Member]
Dec. 31, 2012
5 7/8% Senior Subordinated Notes [Member]
Feb. 09, 2012
5 7/8% Senior Subordinated Notes [Member]
Dec. 31, 2012
5% Senior Subordinated Notes [Member]
Oct. 30, 2012
5% Senior Subordinated Notes [Member]
Dec. 31, 2012
9 3/4% Senior Notes [Member]
Dec. 31, 2011
9 3/4% Senior Notes [Member]
Mar. 27, 2009
9 3/4% Senior Notes [Member]
Dec. 31, 2012
LAMAR MEDIA CORP [Member]
7 7/8% Senior Subordinated Notes [Member]
Dec. 31, 2012
LAMAR MEDIA CORP [Member]
6 5/8% Senior Subordinated Notes [Member]
Dec. 31, 2012
LAMAR MEDIA CORP [Member]
6 5/8% Senior Subordinated Notes - Series B [Member]
Dec. 31, 2012
LAMAR MEDIA CORP [Member]
6 5/8% Senior Subordinated Notes - Series C [Member]
Dec. 31, 2012
LAMAR MEDIA CORP [Member]
5 7/8% Senior Subordinated Notes [Member]
Dec. 31, 2012
LAMAR MEDIA CORP [Member]
5% Senior Subordinated Notes [Member]
Dec. 31, 2012
LAMAR MEDIA CORP [Member]
9 3/4% Senior Notes [Member]
Debt Instrument [Line Items]                                              
Interest rate on senior notes 2.875% 7.875% 7.875% 6.625% 6.625% 6.625% 6.625% 6.625% 6.625% 5.875% 5.875% 5.00% 5.00% 9.75% 9.75% 9.75% 7.875% 6.625% 6.625% 6.625% 5.875% 5.00% 9.75%