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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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%

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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 that is attributable to changes in the income tax laws or rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32059-109318 + Details
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