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Summarized Financial Information of Subsidiaries - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | 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]
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Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate stated on notes |  |  | 2.875% | 9.75% | 9.75% | 9.75%
Balance of permitted transfers to parent company | $ 1,706,875 | $ 1,641,856 |  |  |  |
Description of provisions on senior credit facility transfers to Lamar Advertising subject to additional restrictions | The total holdings debt ratio is greater than 5.75 to 1 or (y) the senior debt ratio is greater than 3.25 to 1.0, and (ii) if under the indenture for Lamar Media's 9 3/4% senior notes and as defined therein, its senior leverage ratio is greater than or equal to 3.0 to 1. |  |  |  |  |
Description of actual position on senior credit facility transfers to Lamar Advertising not subject to additional restrictions | The total holdings debt ratio was less than 5.75 to 1 and Lamar Media's senior debt ratio was less than 3.25 to 1 and its senior leverage ratio was less than 3.0 to 1; therefore, transfers to Lamar Advertising were not subject to any additional restrictions under the senior credit facility or pursuant to the indenture governing the 9 3/4% senior notes. |  |  |  |  |
Holdings debt ratio | 5.75 |  |  |  |  |
Senior debt ratio | 3.25 |  |  |  |  |
Senior leverage ratio | 3.0 |  |  |  |  |
Holdings debt ratio related to actual position on senior credit facility | 5.75 |  |  |  |  |
Senior debt ratio related to actual position on senior credit facility | 3.25 |  |  |  |  |
Senior leverage ratio related to actual position on senior credit facility | 3.0 |  |  |  |  |

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