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Acquisitions and Dispositions - Schedule of Assumptions Used in Valuation of FCC Broadcasting Licenses (Detail)	12 Months Ended
	Dec. 31, 2018
CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Market revenue shares at maturity	5.30%
Operating income margins at maturity	36.00%
CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member] | Measurement Input, Discount Rate [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Fair value assumptions inputs rate	9.00%
WXTU-FM [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Market revenue shares at maturity	5.40%
Operating income margins at maturity	30.50%
WXTU-FM [Member] | Measurement Input, Discount Rate [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Fair value assumptions inputs rate	9.00%
Minimum [Member] | CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [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] | WXTU-FM [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Fair value assumptions inputs rate	0.60%
Maximum [Member] | CBS Radio Stations Inc., Entercom Boston LLC and The Entercom Divestiture Trust [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Fair value assumptions inputs rate	2.40%
Maximum [Member] | WXTU-FM [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Fair value assumptions inputs rate	1.30%

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