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Assets Held for Sale and Discontinued Operations - Additional Information (Details) - Held-for-sale
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Aug. 03, 2018
USD ($)
radio_station
Jun. 22, 2018
USD ($)
radio_station
Dec. 31, 2017
radio_station
Radio Segment                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of radio stations | radio_station               34
Impairment of goodwill | $ $ 5,900 $ 20,000 $ 0 $ 25,900 $ 0      
Radio Stations, Tulsa                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of radio stations contracted to sell | radio_station             5  
Expected proceeds from divestiture | $             $ 12,500  
Subsequent Event | Radio Stations, Milwaukee                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of radio stations contracted to sell | radio_station           2    
Expected proceeds from divestiture | $           $ 16,000