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Revenues - Summary of Disaggregation of Broadcast Advertising Revenue by Sales Channel (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation Of Revenue [Line Items]
Total revenue	$ 91,851	$ 78,176
Advertising
Disaggregation Of Revenue [Line Items]
Total revenue	24,097	27,836
Advertising | Local Direct
Disaggregation Of Revenue [Line Items]
Total revenue	4,810	5,034
Advertising | Local Agency
Disaggregation Of Revenue [Line Items]
Total revenue	10,539	12,903
Advertising | National Agency
Disaggregation Of Revenue [Line Items]
Total revenue	$ 8,748	$ 9,899

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