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Goodwill and Intangible Assets - Textual (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
reportable_segment
Dec. 31, 2017
USD ($)
reportable_segment
Dec. 31, 2016
USD ($)
reportable_segment
Goodwill [Line Items]        
Asset Impairment Charges $ 56,732,000 $ 80,057,000 $ 4,415,000 $ 48,524,000
Number of Reporting Units | reportable_segment   3 2 3
Goodwill, impaired, accumulated impairment loss $ 173,205,000 $ 173,205,000    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   7 years    
Amortization of intangibles   $ 19,085,000 $ 19,601,000 $ 24,153,000
Amortization Of Intangible Assets, Finite Lived     $ 17,125,000 $ 21,726,000
Trademarks [Member]        
Goodwill [Line Items]        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   $ 3,180,000    
Customer Relationships        
Goodwill [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   6 years    
Other Intangible Assets        
Goodwill [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   8 years    
Global Integrated Agencies [Member]        
Goodwill [Line Items]        
Number of Reporting Units | reportable_segment   1 1  
Media Services [Member]        
Goodwill [Line Items]        
Number of Reporting Units | reportable_segment   1 1  
All Other [Member]        
Goodwill [Line Items]        
Number of Reporting Units | reportable_segment   1