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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
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Dec. 31, 2021
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%

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