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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 |

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