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Description of Business and Basis of Presentation - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2015
markets
segment
Jun. 30, 2014
USD ($)
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  
Net Cash Used in Operating Activities      
Description of Business and Basis of Presentation [Line Items]      
Misclassification correction     $ 10.2
Net Cash Used in Investing Activities      
Description of Business and Basis of Presentation [Line Items]      
Misclassification correction     10.2
Billboard Revenue      
Description of Business and Basis of Presentation [Line Items]      
Reclassification adjustment $ 1.1   3.7
Transit and Other Revenue      
Description of Business and Basis of Presentation [Line Items]      
Reclassification adjustment $ 1.1   $ 3.7
Minimum      
Description of Business and Basis of Presentation [Line Items]      
Number of Markets in Which the Entity Operates | markets   180