Revenues - Summary of Revenues Disaggregated by Major Source (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	$ 197,172	$ 148,880
Digital Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	153,711	101,482
Broadcast Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	31,457	33,675
Spectrum Usage Rights
Disaggregation Of Revenue [Line Items]
Total revenue	1,535	2,844
Retransmission Consent
Disaggregation Of Revenue [Line Items]
Total revenue	9,195	9,647
Other
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,274	$ 1,232