Related Party Transactions - Narrative (Details) $ in Millions |
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Sep. 30, 2016
USD ($)
joint_venture
Displays
|
Sep. 30, 2015
USD ($)
|
Sep. 30, 2016
USD ($)
joint_venture
Displays
|
Sep. 30, 2015
USD ($)
|
Dec. 31, 2015
USD ($)
|
|
Related Party Transaction [Line Items] | |||||
Equity method investment, ownership percentage | 50.00% | 50.00% | |||
Equity method investments | $ | $ 23.4 | $ 23.4 | $ 21.3 | ||
Management fee revenue | $ | $ 1.9 | $ 2.0 | $ 5.4 | $ 5.3 | |
Transit shelter joint ventures | |||||
Related Party Transaction [Line Items] | |||||
Equity method investment, number of investments | joint_venture | 2 | 2 | |||
Acquired joint ventures | |||||
Related Party Transaction [Line Items] | |||||
Equity method investment, number of investments | joint_venture | 3 | 3 | |||
Equity method investment, number of displays | Displays | 15 | 15 |