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Acquisitions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]    
Total purchase price of outdoor advertising assets $ 230,009 $ 23,497
Total purchase price of outdoor advertising assets paid in cash 206,068  
Non cash consideration of outdoor advertising assets 23,941  
Gain on exchange of outdoor advertising assets 9,805  
Total acquired intangible assets 157,484 11,033
Portion of acquired intangible assets assigned to goodwill 60,968 775
Amount deductible for tax purposes 23,937 775
Aggregate amortization expense related to the 2011 acquisitions 679 358
Customer lists and contracts [Member]
    
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]    
Weighted average useful life 7  
Total acquired intangible assets 18,148 2,010
Weighted average useful life   7 years
Other [Member]
    
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]    
Weighted average useful life 14  
Total acquired intangible assets 96,516 10,258
Weighted average useful life   14 years
Site locations [Member]
    
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]    
Weighted average useful life 15  
Total acquired intangible assets $ 78,288 $ 8,147
Weighted average useful life   15 years