Revenues - Summary of Revenues Disaggregated by Major Source (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 760,192	$ 344,026	$ 273,575
Digital Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	555,338	143,309	68,908
Broadcast Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	154,297	152,677	148,082
Spectrum Usage Rights
Disaggregation Of Revenue [Line Items]
Total revenue	6,195	5,429	13,061
Retransmission Consent
Disaggregation Of Revenue [Line Items]
Total revenue	37,041	36,766	35,362
Other
Disaggregation Of Revenue [Line Items]
Total revenue	$ 7,321	$ 5,845	$ 8,162