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Description of Business and Basis of Presentation - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2015
markets
segment
Sep. 30, 2014
USD ($)
Description of Business and Basis of Presentation [Line Items]      
Number of Largest Markets in Which the Entity Operates, Domestic | markets   25  
Number of reportable segments | segment   2  
Billboard Revenue      
Description of Business and Basis of Presentation [Line Items]      
Reclassification adjustment $ 2.5   $ 1.2
Transit and Other Revenue      
Description of Business and Basis of Presentation [Line Items]      
Reclassification adjustment $ 2.5   $ 1.2
Minimum      
Description of Business and Basis of Presentation [Line Items]      
Number of Markets in Which the Entity Operates | markets   180