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Summarized Financial Information of Subsidiaries - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Debt Disclosure [Abstract] |  |
Balance of permitted transfers to parent company | $ 2,072,542 | $ 1,706,875
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; therefore, transfers to Lamar Advertising were not subject to any additional restrictions under the senior credit facility. |
Holdings debt ratio | 5.75 |
Senior debt ratio | 3.25 |
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. |
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 |

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- Definition Description of Position on senior credit facility transfers to Parent Company not subject to additional restrictions. + References No definition available. + Details
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- Definition Description of Provisions On senior credit facility transfers to Parent Company subject to additional restrictions. + References No definition available. + Details
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- Definition Maximum actual holdings debt ratio. + References No definition available. + Details
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- Definition Maximum actual senior debt ratio. + References No definition available. + Details
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- Definition Minimum holding debt ratio for applicability of restriction on transfer. + References No definition available. + Details
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- Definition Minimum senior debt ratio for applicability of restriction on transfer. + References No definition available. + Details
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- Details
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