Revenues - Summary of Disaggregation of Broadcast Advertising Revenue by Sales Channel (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,106,867	$ 956,209	$ 760,192
Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	124,722	161,713	154,297
Advertising | Local Direct
Disaggregation Of Revenue [Line Items]
Total revenue	21,826	22,931	23,070
Advertising | Local Agency
Disaggregation Of Revenue [Line Items]
Total revenue	54,485	54,094	59,865
Advertising | National Agency
Disaggregation Of Revenue [Line Items]
Total revenue	$ 48,411	$ 84,688	$ 71,362