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Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Billboard State Transit | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 LAMAR MEDIA CORP [Member] Billboard State | Dec. 31, 2012 LAMAR MEDIA CORP [Member] | Dec. 31, 2011 LAMAR MEDIA CORP [Member] | Dec. 31, 2012 Accumulated Deficit [Member] | Dec. 31, 2011 Accumulated Deficit [Member] | Dec. 31, 2010 Accumulated Deficit [Member] | Dec. 31, 2010 Deferred Income Liability [Member] | Dec. 31, 2012 Current Deferred Income Liabilities [Member] | Dec. 31, 2011 Current Deferred Income Liabilities [Member] | Dec. 31, 2012 Total Revenue [Member] | Dec. 31, 2011 Total Revenue [Member] | Dec. 31, 2012 Net Income [Member] | Dec. 31, 2011 Net Income [Member] | Dec. 31, 2013 Stock options [Member] | Dec. 31, 2013 Performance-based stock incentive program [Member] | Dec. 31, 2013 Stock awards to directors [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of advertising displays | 145,000 |  |  | 145,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which the company operates | 44 |  |  | 44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which the company operates logo sign business | 22 |  |  | 22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of transit advertising displays | 38,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which the company operates | 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Immaterial amount being corrected |  |  |  |  |  |  | $ 13,208 | $ 11,227 | $ 9,585 | $ 15,713 | $ 21,651 | $ 18,486 | $ 3,165 | $ 2,773 | $ 1,931 | $ 1,692 |  |  |  |  |
Decrease in earnings per basic and diluted shares |  | $ 0.02 | $ 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 15 years
Dilutive shares | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non cash compensation expense | $ 24,936 | $ 14,466 | $ 11,650 | $ 24,936 | $ 14,466 | $ 11,650 |  |  |  |  |  |  |  |  |  |  | $ 17,340 | $ 7,231 | $ 365 |  |
Investment maturity period | Three months or less |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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