Revenues - Summary of Disaggregation of Broadcast Advertising Revenue by Sales Channel (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Total revenue	$ 274,417	$ 241,014	$ 786,804	$ 659,881
Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	30,791	39,965	91,401	106,769
Advertising | Local Direct
Disaggregation Of Revenue [Line Items]
Total revenue	5,485	5,935	16,273	17,365
Advertising | Local Agency
Disaggregation Of Revenue [Line Items]
Total revenue	13,946	13,410	40,505	38,980
Advertising | National Agency
Disaggregation Of Revenue [Line Items]
Total revenue	$ 11,360	$ 20,620	$ 34,623	$ 50,424