Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net revenue	$ 199,008	$ 62,978	$ 526,298	$ 172,343
Direct operating expenses	28,583	24,178	83,480	72,997
Selling, general and administrative expenses	14,530	9,883	41,489	34,371
Depreciation and amortization	5,901	3,934	16,159	12,319
Operating income (loss)	20,497	14,251	48,105	(22,416)
Corporate expenses	7,253	6,287	21,756	18,511
Impairment charge	166		1,604	39,835
Foreign currency (gain) loss	177	(680)	454	673
Other operating (gain) loss	(2,431)	(2,683)	(4,867)	(5,549)
Interest expense	(1,714)	(1,969)	(5,287)	(6,673)
Interest income	12	467	235	1,630
Dividend income	207	3	211	26
Income (loss) before income taxes	19,002	12,752	43,264	(27,433)
Capital expenditures	1,321	1,841	3,949	7,450
Total assets	$ 828,403		$ 828,403		$ 747,345
Percentage change in net revenue	216.00%		205.00%
Percentage change in direct operating expenses	18.00%		14.00%
Percentage change in selling, general and administrative expenses	47.00%		21.00%
Percentage change in depreciation and amortization	50.00%		31.00%
Percentage change in segment operating profit (loss)	49.00%		116.00%
Percentage change in corporate expenses	15.00%		18.00%
Percentage change in impairment charge			(96.00%)
Percentage change in foreign currency (gain) loss			(33.00%)
Percentage change in other operating (gain) loss	(9.00%)		(12.00%)
Percentage change in operating income (loss)	44.00%
Percentage change in interest expense	(13.00%)		(21.00%)
Percentage change in interest income	(97.00%)		(86.00%)
Percentage change in dividend income			712.00%
Percentage change in income (loss) before income taxes	49.00%
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 25,662	17,175	$ 67,052	31,054
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	7,253	6,287	21,756	18,511
Television
Segment Reporting Information [Line Items]
Direct operating expenses	15,565	14,582	45,737	43,465
Selling, general and administrative expenses	4,583	4,396	13,811	15,006
Depreciation and amortization	3,087	3,387	9,410	9,673
Capital expenditures	685	1,243	2,146	5,750
Total assets	$ 433,669		$ 433,669		425,899
Percentage change in direct operating expenses	7.00%		5.00%
Percentage change in selling, general and administrative expenses	4.00%		(8.00%)
Percentage change in depreciation and amortization	(9.00%)		(3.00%)
Percentage change in segment operating profit (loss)	(14.00%)		5.00%
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 13,215	15,421	$ 37,640	35,796
Television \| Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue	$ 36,450	37,786	$ 106,598	103,940
Percentage change in net revenue	(4.00%)		3.00%
Radio
Segment Reporting Information [Line Items]
Direct operating expenses	$ 6,784	6,628	$ 20,370	20,428
Selling, general and administrative expenses	2,994	3,072	8,987	10,066
Depreciation and amortization	335	435	1,076	1,384
Capital expenditures	143	136	436	467
Total assets	$ 114,121		$ 114,121		125,426
Percentage change in direct operating expenses	2.00%		(0.00%)
Percentage change in selling, general and administrative expenses	(3.00%)		(11.00%)
Percentage change in depreciation and amortization	(23.00%)		(22.00%)
Percentage change in segment operating profit (loss)	351.00%
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 6,324	1,402	$ 11,441	(1,834)
Radio \| Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue	$ 16,437	11,537	$ 41,874	30,044
Percentage change in net revenue	42.00%		39.00%
Digital
Segment Reporting Information [Line Items]
Cost of revenue	$ 124,332	7,808	$ 318,118	21,602
Direct operating expenses	6,234	2,968	17,373	9,104
Selling, general and administrative expenses	6,953	2,415	18,691	9,299
Depreciation and amortization	2,479	112	5,673	1,262
Capital expenditures	493	462	1,367	1,233
Total assets	$ 280,613		$ 280,613		$ 196,020
Percentage change in direct operating expenses	110.00%		91.00%
Percentage change in selling, general and administrative expenses	188.00%		101.00%
Percentage change in depreciation and amortization			350.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 6,123	352	$ 17,971	(2,908)
Digital \| Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue	$ 146,121	$ 13,655	$ 377,826	$ 38,359
Percentage change in net revenue	970.00%		885.00%

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