Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net revenue	$ 62,978	$ 68,816	$ 172,343	$ 202,737
Direct operating expenses	24,178	30,807	72,997	89,392
Selling, general and administrative expenses	9,883	12,457	34,371	39,816
Depreciation and amortization	3,934	4,190	12,319	12,412
Operating income (loss)	14,251	(3,795)	(22,416)	(10,385)
Corporate expenses	6,287	6,785	18,511	20,180
Change in fair value contingent consideration				(2,376)
Impairment charge		9,075	39,835	31,443
Foreign currency (gain) loss	(680)	927	673	977
Other operating (gain) loss	(2,683)	(1,572)	(5,549)	(5,165)
Interest expense	(1,969)	(3,537)	(6,673)	(10,581)
Interest income	467	825	1,630	2,601
Dividend income	3	241	26	747
Income (loss) before income taxes	12,752	(6,266)	(27,433)	(17,618)
Capital expenditures	1,841	7,610	7,450	22,433
Total assets	$ 599,378		$ 599,378		$ 656,200
Percentage change in net revenue	(8.00%)		(15.00%)
Percentage change in direct operating expenses	(22.00%)		(18.00%)
Percentage change in selling, general and administrative expenses	(21.00%)		(14.00%)
Percentage change in depreciation and amortization	(6.00%)		(1.00%)
Percentage change in segment operating profit (loss)	50.00%		(10.00%)
Percentage change in corporate expenses	(7.00%)		(8.00%)
Change in fair value contingent consideration	0.00%		(100.00%)
Percentage change in impairment charge	(100.00%)		27.00%
Percentage change in foreign currency (gain) loss			(31.00%)
Percentage change in other operating (gain) loss	71.00%		7.00%
Percentage change in operating income (loss)			116.00%
Percentage change in interest expense	(44.00%)		(37.00%)
Percentage change in interest income	(43.00%)		(37.00%)
Percentage change in dividend income	(99.00%)		(97.00%)
Percentage change in income (loss) before income taxes			56.00%
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 17,175	11,420	$ 31,054	34,674
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	6,287	6,785	18,511	20,180
Television
Segment Reporting Information [Line Items]
Net revenue	37,786	36,421	103,940	112,745
Direct operating expenses	14,582	15,661	43,465	45,745
Selling, general and administrative expenses	4,396	5,497	15,006	16,945
Depreciation and amortization	3,387	2,613	9,673	7,435
Capital expenditures	1,243	7,460	5,750	21,462
Total assets	$ 443,035		$ 443,035		465,758
Percentage change in net revenue	4.00%		(8.00%)
Percentage change in direct operating expenses	(7.00%)		(5.00%)
Percentage change in selling, general and administrative expenses	(20.00%)		(11.00%)
Percentage change in depreciation and amortization	30.00%		30.00%
Percentage change in segment operating profit (loss)	22.00%		(16.00%)
Television | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 15,421	12,650	$ 35,796	42,620
Radio
Segment Reporting Information [Line Items]
Net revenue	11,537	14,783	30,044	41,104
Direct operating expenses	6,628	9,932	20,428	28,968
Selling, general and administrative expenses	3,072	4,209	10,066	13,380
Depreciation and amortization	435	465	1,384	1,368
Capital expenditures	136	86	467	667
Total assets	$ 122,268		$ 122,268		138,463
Percentage change in net revenue	(22.00%)		(27.00%)
Percentage change in direct operating expenses	(33.00%)		(29.00%)
Percentage change in selling, general and administrative expenses	(27.00%)		(25.00%)
Percentage change in depreciation and amortization	(6.00%)		1.00%
Percentage change in segment operating profit (loss)	692.00%		(30.00%)
Radio | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 1,402	177	$ (1,834)	(2,612)
Digital
Segment Reporting Information [Line Items]
Net revenue	13,655	17,612	38,359	48,888
Cost of revenue	7,808	9,942	21,602	26,443
Direct operating expenses	2,968	5,214	9,104	14,679
Selling, general and administrative expenses	2,415	2,751	9,299	9,491
Depreciation and amortization	112	1,112	1,262	3,609
Capital expenditures	462	64	1,233	304
Total assets	$ 34,075		$ 34,075		$ 51,979
Percentage change in net revenue	(22.00%)		(22.00%)
Percentage change in cost of revenue	(21.00%)		(18.00%)
Percentage change in direct operating expenses	(43.00%)		(38.00%)
Percentage change in selling, general and administrative expenses	(12.00%)		(2.00%)
Percentage change in depreciation and amortization	(90.00%)		(65.00%)
Percentage change in segment operating profit (loss)			(45.00%)
Digital | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 352	$ (1,407)	$ (2,908)	$ (5,334)