Revenues - Summary of Disaggregation of Broadcast Advertising Revenue by Sales Channel (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Total revenue	$ 239,006	$ 197,172
Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	29,627	31,457
Advertising | Local Direct
Disaggregation Of Revenue [Line Items]
Total revenue	5,308	5,421
Advertising | Local Agency
Disaggregation Of Revenue [Line Items]
Total revenue	12,872	12,553
Advertising | National Agency
Disaggregation Of Revenue [Line Items]
Total revenue	$ 11,447	$ 13,483