Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021 Segment Station Market	Mar. 31, 2020
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Percentage of revenue generated from outside the United States	65.00%	14.00%
Television
Segment Reporting Information [Line Items]
Number of stations owned	54
Radio
Segment Reporting Information [Line Items]
Number of stations owned	48
Advertisements and Syndicates Radio Programming | Minimum
Segment Reporting Information [Line Items]
Number of markets owned | Market	100