Fair Value Measurement Disclosures - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
FCC broadcasting licenses	$ 297,179,000	$ 311,282,000
Radio FCC Licenses | Significant unobservable inputs (Level 3) | Discounted Cash Flow Methodology
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
FCC broadcasting licenses	295,100,000
FCC broadcasting licenses, fair value	281,000,000
Non-cash impairment loss	14,100,000
Television FCC Licenses | Significant unobservable inputs (Level 3) | Discounted Cash Flow Methodology
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
FCC broadcasting licenses	16,200,000
Non-cash impairment loss	$ 0