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FCC Licenses - Discounted Cash Flow Analyses (Detail) - CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member]
 12 Months Ended
Dec. 31, 2019
Fair Value Inputs Asset Quantitative Information [Line Items]  
Market revenue shares at maturity 5.40%
Operating income margins at maturity 30.50%
Measurement Input, Discount Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate 9.00%
Maximum [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Market revenue shares at maturity 1.10%
Operating income margins at maturity 29.80%
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate 1.40%
Maximum [Member] | Measurement Input, Discount Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate 1.30%
Minimum [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Market revenue shares at maturity 0.60%
Operating income margins at maturity 27.50%
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate 0.50%
Minimum [Member] | Measurement Input, Discount Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate 0.60%