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Assets Held for Sale and Discontinued Operations - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
radio_station
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
radio_station
Sep. 30, 2018
USD ($)
radio_station
Sep. 30, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Fees related to marketing agreements $ 400        
Radio Segment | Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of radio stations | radio_station 34   34 34  
Proceeds from sale of radio stations     $ 75,500    
Number of radio stations expected to sell | radio_station 8   8 8  
Expected proceeds from divestiture $ 8,000   $ 8,000 $ 8,000  
Impairment of goodwill $ 0 $ 0   $ 25,900 $ 0