Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill, Beginning balance	$ 58,043,000	$ 46,511,000
Acquisition	15,487,000	12,332,000
Impairment		(800,000)
Purchase Price Adjustments	(1,822,000)
Goodwill, Ending balance	71,708,000	58,043,000
Digital
Goodwill [Line Items]
Goodwill, Beginning balance	17,494,000	5,962,000
Acquisition	15,487,000	12,332,000
Impairment	0	(800,000)
Purchase Price Adjustments	(1,822,000)
Goodwill, Ending balance	31,159,000	17,494,000
Television
Goodwill [Line Items]
Goodwill, Beginning balance	40,549,000	40,549,000
Acquisition	0	0
Impairment	0	0
Purchase Price Adjustments	0
Goodwill, Ending balance	40,549,000	40,549,000
Audio
Goodwill [Line Items]
Goodwill, Beginning balance	0	0
Goodwill, Ending balance	$ 0	$ 0