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Goodwill - Summary of Key Assumptions Used in the Discounted Cash Flow Analyses (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2022
Sep. 30, 2023
Measurement Input, Discount Rate [Member]      
Goodwill [Line Items]      
Revenue growth rates 10.00% 9.50%  
Goodwill [Member] | Philadelphia, PA Market Cluster [Member]      
Goodwill [Line Items]      
Operating income margins     27.90%
Goodwill [Member] | Measurement Input, Discount Rate [Member] | Boston, MA radio market cluster [Member]      
Goodwill [Line Items]      
Revenue growth rates     9.50%
Goodwill [Member] | Measurement Input, Discount Rate [Member] | Philadelphia, PA Market Cluster [Member]      
Goodwill [Line Items]      
Revenue growth rates     10.00%
Minimum [Member]      
Goodwill [Line Items]      
Operating income margins 19.70% 19.20%  
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]      
Goodwill [Line Items]      
Revenue growth rates (1.20%) (1.90%)  
Minimum [Member] | Goodwill [Member] | Boston, MA radio market cluster [Member]      
Goodwill [Line Items]      
Operating income margins     5.40%
Minimum [Member] | Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Boston, MA radio market cluster [Member]      
Goodwill [Line Items]      
Revenue growth rates     (1.90%)
Minimum [Member] | Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Philadelphia, PA Market Cluster [Member]      
Goodwill [Line Items]      
Revenue growth rates     (9.30%)
Maximum [Member]      
Goodwill [Line Items]      
Operating income margins 30.40% 32.60%  
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]      
Goodwill [Line Items]      
Revenue growth rates 1.80% 15.90%  
Maximum [Member] | Goodwill [Member] | Boston, MA radio market cluster [Member]      
Goodwill [Line Items]      
Operating income margins     29.80%
Maximum [Member] | Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Boston, MA radio market cluster [Member]      
Goodwill [Line Items]      
Revenue growth rates     11.10%
Maximum [Member] | Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Philadelphia, PA Market Cluster [Member]      
Goodwill [Line Items]      
Revenue growth rates     1.40%