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Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
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