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Long-term Debt - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Debt Instrument [Line Items] |  |
Long Term Debt | $ 2,160,854 | $ 2,158,528
Less current maturities | (33,134) | (17,310)
Long-term debt excluding current maturities | 2,127,720 | 2,141,218
LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 2,160,854 | 2,158,528
Less current maturities | (33,134) | (17,310)
Long-term debt excluding current maturities | 2,127,720 | 2,141,218
Senior Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 384,664 | 595,477
Senior Credit Agreement [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 384,664 | 595,477
7 7/8% Senior Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 400,000 | 400,000
7 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 400,000 | 400,000
6 5/8% Senior Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 381,290
Long-term debt excluding current maturities | 0 |
6 5/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 381,290
6 5/8% Senior Subordinated Notes - Series B [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 191,544
6 5/8% Senior Subordinated Notes - Series B [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 191,544
6 5/8% Senior Subordinated Notes - Series C [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 256,040
6 5/8% Senior Subordinated Notes - Series C [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt |  | 256,040
5 7/8% Senior Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 500,000 |
5 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 500,000 |
5% Senior Subordinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 535,000 |
5% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 535,000 |
9 3/4% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 339,121 | 331,553
9 3/4% Senior Notes [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 339,121 | 331,553
Other notes with various rates and terms [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | 2,069 | 2,624
Other notes with various rates and terms [Member] | LAMAR MEDIA CORP [Member] |  |
Debt Instrument [Line Items] |  |
Long Term Debt | $ 2,069 | $ 2,624

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