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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Ontario Bill 114 [Member]	Dec. 31, 2011 Puerto Rico [Member]	Dec. 31, 2010 Puerto Rico [Member]	Dec. 31, 2013 Subsequent Event [Member] Ontario Bill 114 [Member]	Dec. 31, 2012 LAMAR MEDIA CORP [Member]	Dec. 31, 2011 LAMAR MEDIA CORP [Member]	Dec. 31, 2012 LAMAR MEDIA CORP [Member] Ontario Bill 114 [Member]	Dec. 31, 2011 LAMAR MEDIA CORP [Member] Puerto Rico [Member]	Dec. 31, 2010 LAMAR MEDIA CORP [Member] Puerto Rico [Member]	Dec. 31, 2013 LAMAR MEDIA CORP [Member] Subsequent Event [Member] Ontario Bill 114 [Member]
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]
Deferred tax benefit related to APB 23 assertion	$ 4,023						$ 4,023
Corporate Rico tax rate			11.50%	30.00%	39.00%				11.50%	30.00%	39.00%
Rate Change	$ 49	$ 1,743	$ 49	$ 1,743			$ 49	$ 1,743	$ 49	$ 1,743
Enacted reduction rate			11.00%			10.00%			11.00%			10.00%

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to changes in the income tax rates under enacted tax laws in the period.

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