Revenues - Summary of Revenues Disaggregated by Major Source (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	$ 241,014	$ 199,008	$ 659,881	$ 526,298
Digital Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	188,877	146,121	516,966	377,826
Broadcast Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	39,965	40,495	106,769	110,608
Spectrum Usage Rights
Disaggregation Of Revenue [Line Items]
Total revenue	1,584	1,104	4,793	5,057
Retransmission Consent
Disaggregation Of Revenue [Line Items]
Total revenue	8,926	9,128	27,159	28,061
Other
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,662	$ 2,160	$ 4,194	$ 4,746