Revenues - Summary of Disaggregation of Broadcast Advertising Revenue by Sales Channel (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 956,209	$ 760,192	$ 344,026
Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	161,713	154,297	152,677
Advertising | Local Direct
Disaggregation Of Revenue [Line Items]
Total revenue	22,931	23,070	21,334
Advertising | Local Agency
Disaggregation Of Revenue [Line Items]
Total revenue	54,094	59,865	48,702
Advertising | National Agency
Disaggregation Of Revenue [Line Items]
Total revenue	$ 84,688	$ 71,362	$ 82,641