Segment Information - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021 Segment Station Market	Sep. 30, 2020
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			3
Percentage of revenue generated from outside the United States	70.00%	14.00%	68.00%	15.00%
Television
Segment Reporting Information [Line Items]
Number of stations owned			53
Radio
Segment Reporting Information [Line Items]
Number of stations owned			46
Advertisements and Syndicates Radio Programming | Minimum
Segment Reporting Information [Line Items]
Number of markets owned | Market			100