Segment Data - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 Segment Station Market	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Percentage of revenue generated from outside the United States	36.00%	18.00%	18.00%
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