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Goodwill - Summary of Key Assumptions Used in the Discounted Cash Flow Analyses (Detail)	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2022
Minimum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Operating income margins	19.70%	19.20%
Maximum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Operating income margins	30.40%	32.60%
Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Revenue growth rates	0.30%	(1.90%)
Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Revenue growth rates	2.70%	15.90%
Measurement Input, Discount Rate [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Revenue growth rates	9.50%	9.50%
Goodwill [Member] | Minimum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Operating income margins			5.40%
Goodwill [Member] | Maximum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Operating income margins			29.80%
Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Revenue growth rates			(1.90%)
Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Revenue growth rates			11.10%
Goodwill [Member] | Measurement Input, Discount Rate [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Revenue growth rates			9.50%
Boston, MA radio market cluster [Member] | Goodwill [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Operating income margins			13.10%
Boston, MA radio market cluster [Member] | Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Revenue growth rates			0.50%
Boston, MA radio market cluster [Member] | Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Revenue growth rates			11.40%
Boston, MA radio market cluster [Member] | Goodwill [Member] | Measurement Input, Discount Rate [Member]
Disclosure in tabular form of assumptions used in determination of fair value of goodwill [Line Items]
Revenue growth rates			9.50%

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- Definition

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Fair Value Assumptions Inputs Rate.

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