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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]      
Income tax expense at U.S. federal statutory rate $ 22,043 $ 5,646 $ 4,340
State and local income taxes, net of federal income tax benefit 3,585 1,541 847
Book expenses not deductible for tax purposes 1,351 1,058 746
Stock-based compensation 65 270 464
Undistributed earnings of Canadian subsidiaries     (4,023)
Valuation allowance (1,097) (331) 382
Rate Change (2,565) 49 1,743
Other differences, net (541) 9 1,043
Income tax expense 22,841 8,242 5,542
LAMAR MEDIA CORP [Member]
      
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]      
Income tax expense at U.S. federal statutory rate 22,160 5,764 4,465
State and local income taxes, net of federal income tax benefit 3,601 1,557 865
Book expenses not deductible for tax purposes 1,351 1,058 746
Stock-based compensation 65 270 464
Amortization of non-deductible goodwill     1
Undistributed earnings of Canadian subsidiaries     (4,023)
Valuation allowance (1,094) (354) 382
Rate Change (2,565) 49 1,743
Other differences, net (541) 9 1,195
Income tax expense $ 22,977 $ 8,353 $ 5,838