XML 38 R27.htm IDEA: XBRL DOCUMENT v3.20.2
FCC Licenses - Discounted Cash Flow Analyses (Detail) - CBS Radio Stations Inc Entercom Boston LLC and The Entercom Divestiture Trust [Member]
 6 Months Ended
Jun. 30, 2020
Measurement Input, Discount Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate 9.50%
Minimum [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Market revenue shares at maturity 0.60%
Operating income margins at maturity 26.50%
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate (14.10%)
Maximum [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Market revenue shares at maturity 39.00%
Operating income margins at maturity 35.40%
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate 7.90%