Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill, Beginning balance			$ 74,292,000	$ 70,729,000
Acquisition				3,563,000
Currency			(67,000)
Impairment			(27,714,000)
Goodwill, Ending balance			46,511,000	74,292,000
Television
Goodwill [Line Items]
Goodwill, Beginning balance			40,549,000	40,549,000
Impairment			0
Goodwill, Ending balance			40,549,000	40,549,000
Radio
Goodwill [Line Items]
Goodwill, Beginning balance			0
Goodwill, Ending balance			0	0
Digital Media
Goodwill [Line Items]
Goodwill, Beginning balance			33,743,000	30,180,000
Acquisition				3,563,000
Currency			(67,000)
Impairment	$ (5,300,000)	$ (22,400,000)	(27,714,000)
Goodwill, Ending balance			$ 5,962,000	$ 33,743,000