Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net revenue	$ 68,816	$ 74,575	$ 202,737	$ 215,742
Direct operating expenses	30,807	31,694	89,392	93,844
Selling, general and administrative expenses	12,457	12,398	39,816	38,365
Depreciation and amortization	4,190	4,094	12,412	12,052
Operating income (loss)	(3,795)	6,342	(10,385)	16,096
Corporate expenses	6,785	6,913	20,180	19,154
Change in fair value contingent consideration		(114)	(2,376)	1,073
Impairment charge	9,075		31,443
Foreign currency (gain) loss	927	335	977	531
Other operating (gain) loss	(1,572)	(327)	(5,165)	(622)
Interest expense	(3,537)	(3,995)	(10,581)	(11,394)
Interest income	825	933	2,601	2,885
Dividend income	241	457	747	1,002
Income (loss) before income taxes	(6,266)	3,737	(17,618)	8,589
Capital expenditures	7,610	7,116	22,433	11,547
Total assets	$ 687,842		$ 687,842		$ 690,409
Percentage change in net revenue	(8.00%)		(6.00%)
Percentage change in direct operating expenses	(3.00%)		(5.00%)
Percentage change in selling, general and administrative expenses	0.00%		4.00%
Percentage change in depreciation and amortization	2.00%		3.00%
Percentage change in segment operating profit (loss)	(13.00%)		(4.00%)
Percentage change in corporate expenses	(2.00%)		5.00%
Change in fair value contingent consideration	(100.00%)
Percentage change in foreign currency (gain) loss	177.00%		84.00%
Percentage change in other operating (gain) loss	381.00%		730.00%
Percentage change in interest expense	(11.00%)		(7.00%)
Percentage change in interest income	(12.00%)		(10.00%)
Percentage change in dividend income	(47.00%)		(25.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 11,420	13,149	$ 34,674	36,232
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	6,785	6,913	20,180	19,154
Television
Segment Reporting Information [Line Items]
Net revenue	36,421	36,361	112,745	107,383
Direct operating expenses	15,661	15,315	45,745	45,903
Selling, general and administrative expenses	5,497	5,147	16,945	16,670
Depreciation and amortization	2,613	2,227	7,435	6,708
Capital expenditures	7,460	6,819	21,462	10,841
Total assets	$ 499,335		$ 499,335		487,929
Percentage change in net revenue	0.00%		5.00%
Percentage change in direct operating expenses	2.00%		0.00%
Percentage change in selling, general and administrative expenses	7.00%		2.00%
Percentage change in depreciation and amortization	17.00%		11.00%
Percentage change in segment operating profit (loss)	(7.00%)		12.00%
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 12,650	13,672	$ 42,620	38,102
Radio
Segment Reporting Information [Line Items]
Net revenue	14,783	15,783	41,104	47,126
Direct operating expenses	9,932	10,402	28,968	32,011
Selling, general and administrative expenses	4,209	4,274	13,380	13,382
Depreciation and amortization	465	615	1,368	1,855
Capital expenditures	86	71	667	233
Total assets	$ 138,710		$ 138,710		121,020
Percentage change in net revenue	(6.00%)		(13.00%)
Percentage change in direct operating expenses	(5.00%)		(10.00%)
Percentage change in selling, general and administrative expenses	(2.00%)		0.00%
Percentage change in depreciation and amortization	(24.00%)		(26.00%)
Percentage change in segment operating profit (loss)	(64.00%)		2041.00%
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 177	492	$ (2,612)	(122)
Digital
Segment Reporting Information [Line Items]
Net revenue	17,612	22,431	48,888	61,233
Cost of revenue	9,942	13,240	26,443	35,249
Direct operating expenses	5,214	5,977	14,679	15,930
Selling, general and administrative expenses	2,751	2,977	9,491	8,313
Depreciation and amortization	1,112	1,252	3,609	3,489
Capital expenditures	64	226	304	473
Total assets	$ 49,797		$ 49,797		$ 81,460
Percentage change in net revenue	(21.00%)		(20.00%)
Percentage change in cost of revenue	(25.00%)		(25.00%)
Percentage change in direct operating expenses	(13.00%)		(8.00%)
Percentage change in selling, general and administrative expenses	(8.00%)		14.00%
Percentage change in depreciation and amortization	(11.00%)		3.00%
Percentage change in segment operating profit (loss)	39.00%		205.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (1,407)	$ (1,015)	$ (5,334)	$ (1,748)

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