Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net revenue	$ 241,014	$ 199,008	$ 659,881	$ 526,298
Cost of revenue	157,095	124,332	431,951	318,118
Direct operating expenses	30,086	28,583	87,505	83,480
Selling, general and administrative expenses	19,208	14,530	53,022	41,489
Depreciation and amortization	6,554	5,901	19,212	16,159
Operating income (loss)	15,904	20,497	33,511	48,105
Corporate expenses	9,525	7,253	26,769	21,756
Change in fair value of contingent consideration	734		6,810
Impairment charge		166		1,604
Foreign currency (gain) loss	1,966	177	2,112	454
Other operating (gain) loss	(58)	(2,431)	(1,011)	(4,867)
Interest expense	(3,055)	(1,714)	(7,225)	(5,287)
Interest income	788	12	1,916	235
Dividend income	6	207	20	211
Realized gain (loss) on marketable securities	(473)		(473)
Income (loss) before income taxes	13,170	19,002	27,749	43,264
Capital expenditures	4,221	1,321	7,629	3,949
Total assets	$ 876,457		$ 876,457		$ 851,342
Percentage change in net revenue	21.00%		25.00%
Percentage change in direct operating expenses	5.00%		5.00%
Percentage change in selling, general and administrative expenses	32.00%		28.00%
Percentage change in depreciation and amortization	11.00%		19.00%
Percentage change in segment operating profit (loss)	9.00%		2.00%
Percentage change in corporate expenses	31.00%		23.00%
Percentage change in impairment charge	(100.00%)		(100.00%)
Percentage change in foreign currency (gain) loss			365.00%
Percentage change in other operating (gain) loss	(98.00%)		(79.00%)
Percentage change in operating income (loss)	(22.00%)		(30.00%)
Percentage change in interest expense	78.00%		37.00%
Percentage change in interest income			715.00%
Percentage change in dividend income	(97.00%)		(91.00%)
Percentage change in income (loss) before income taxes	(31.00%)		(36.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 28,071	25,662	$ 68,191	67,052
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	9,525	7,253	26,769	21,756
Digital
Segment Reporting Information [Line Items]
Cost of revenue	157,095	124,332	431,951	318,118
Direct operating expenses	8,041	6,234	23,017	17,373
Selling, general and administrative expenses	11,039	6,953	28,560	18,691
Depreciation and amortization	3,230	2,479	8,551	5,673
Capital expenditures	977	493	2,838	1,367
Total assets	$ 394,379		$ 394,379		309,347
Percentage change in cost of revenue	26.00%		36.00%
Percentage change in direct operating expenses	29.00%		32.00%
Percentage change in selling, general and administrative expenses	59.00%		53.00%
Percentage change in depreciation and amortization	30.00%		51.00%
Percentage change in segment operating profit (loss)	55.00%		38.00%
Digital | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 9,472	6,123	$ 24,887	17,971
Digital | Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue	$ 188,877	146,121	$ 516,966	377,826
Percentage change in net revenue	29.00%		37.00%
Television
Segment Reporting Information [Line Items]
Direct operating expenses	$ 14,941	15,565	$ 43,712	45,737
Selling, general and administrative expenses	5,062	4,583	15,257	13,811
Depreciation and amortization	2,723	3,087	8,424	9,410
Capital expenditures	3,121	685	4,257	2,146
Total assets	$ 377,405		$ 377,405		433,303
Percentage change in direct operating expenses	(4.00%)		(4.00%)
Percentage change in selling, general and administrative expenses	10.00%		10.00%
Percentage change in depreciation and amortization	(12.00%)		(10.00%)
Percentage change in segment operating profit (loss)	(2.00%)		(16.00%)
Television | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 12,952	13,215	$ 31,525	37,640
Television | Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue	$ 35,678	36,450	$ 98,918	106,598
Percentage change in net revenue	(2.00%)		(7.00%)
Audio
Segment Reporting Information [Line Items]
Direct operating expenses	$ 7,104	6,784	$ 20,776	20,370
Selling, general and administrative expenses	3,107	2,994	9,205	8,987
Depreciation and amortization	601	335	2,237	1,076
Capital expenditures	123	143	534	436
Total assets	$ 104,673		$ 104,673		$ 108,692
Percentage change in direct operating expenses	5.00%		2.00%
Percentage change in selling, general and administrative expenses	4.00%		2.00%
Percentage change in depreciation and amortization	79.00%		108.00%
Percentage change in segment operating profit (loss)	(11.00%)		3.00%
Audio | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 5,647	6,324	$ 11,779	11,441
Audio | Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue	$ 16,459	$ 16,437	$ 43,997	$ 41,874
Percentage change in net revenue	(0.00%)		5.00%