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Segment Data - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net revenue	$ 171,683	$ 62,978	$ 45,116	$ 64,249	$ 70,838	$ 68,816	$ 69,241	$ 64,680	$ 344,026	$ 273,575	$ 297,815
Direct operating expenses									104,909	119,412	125,242
Selling, general and administrative expenses									48,404	53,965	51,535
Depreciation and amortization									17,282	16,648	16,273
Operating income (loss)									6,608	(1,653)	33,577
Corporate expenses									27,807	28,067	26,865
Change in fair value of contingent consideration										(6,478)	(1,202)
Impairment charge									40,035	32,097
Foreign currency (gain) loss									(1,052)	754	1,616
Other operating (gain) loss									(6,895)	(5,994)	(1,187)
Capital expenditures									9,484	25,284	15,717
Total assets	747,345				656,200				$ 747,345	$ 656,200	690,409
Percentage change in net revenue									26.00%	(8.00%)
Percentage change in direct operating expenses									(12.00%)	(5.00%)
Percentage change in selling, general and administrative expenses									(10.00%)	5.00%
Percentage change in depreciation and amortization									4.00%	2.00%
Percentage change in segment operating profit (loss)									42.00%	(22.00%)
Percentage change in corporate expenses									(1.00%)	4.00%
Percentage change in fair value of contingent consideration									(100.00%)	439.00%
Percentage change in impairment charge									25.00%
Percentage change in foreign currency (gain) loss										(53.00%)
Percentage change in other operating (gain) loss									15.00%	405.00%
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ 66,503	$ 46,793	59,669
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses									27,807	28,067	26,865
Television
Segment Reporting Information [Line Items]
Direct operating expenses									61,145	61,778	62,434
Selling, general and administrative expenses									19,748	22,638	21,864
Depreciation and amortization									12,918	10,059	9,024
Capital expenditures									7,184	24,174	14,336
Total assets	425,899				465,758				$ 425,899	$ 465,758	487,929
Percentage change in direct operating expenses									(1.00%)	(1.00%)
Percentage change in selling, general and administrative expenses									(13.00%)	4.00%
Percentage change in depreciation and amortization									28.00%	11.00%
Percentage change in segment operating profit (loss)									10.00%	(7.00%)
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ 60,645	$ 55,179	59,589
Radio
Segment Reporting Information [Line Items]
Direct operating expenses									28,537	39,277	41,287
Selling, general and administrative expenses									13,252	17,423	18,081
Depreciation and amortization									1,803	1,866	2,490
Capital expenditures									641	792	350
Total assets	125,426				138,463				$ 125,426	$ 138,463	121,020
Percentage change in direct operating expenses									(27.00%)	(5.00%)
Percentage change in selling, general and administrative expenses									(24.00%)	(4.00%)
Percentage change in depreciation and amortization									(3.00%)	(25.00%)
Percentage change in segment operating profit (loss)										(272.00%)
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ 2,669	$ (3,553)	2,064
Digital
Segment Reporting Information [Line Items]
Cost of revenue									106,928	36,757	45,096
Direct operating expenses									15,227	18,357	21,521
Selling, general and administrative expenses									15,404	13,904	11,590
Depreciation and amortization									2,561	4,723	4,759
Capital expenditures									1,659	318	1,031
Total assets	$ 196,020				$ 51,979				$ 196,020	$ 51,979	81,460
Percentage change in cost of revenue									191.00%	(18.00%)
Percentage change in direct operating expenses									(17.00%)	(15.00%)
Percentage change in selling, general and administrative expenses									11.00%	20.00%
Percentage change in depreciation and amortization									(46.00%)	(1.00%)
Percentage change in segment operating profit (loss)									(166.00%)	144.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ 3,189	$ (4,833)	(1,984)
Advertising and Retransmission Consent \| Television
Segment Reporting Information [Line Items]
Net revenue									$ 154,456	$ 149,654	152,911
Percentage change in net revenue									3.00%	(2.00%)
Advertising and Retransmission Consent \| Radio
Segment Reporting Information [Line Items]
Net revenue									$ 46,261	$ 55,013	63,922
Percentage change in net revenue									(16.00%)	(14.00%)
Advertising and Retransmission Consent \| Digital
Segment Reporting Information [Line Items]
Net revenue									$ 143,309	$ 68,908	$ 80,982
Percentage change in net revenue									108.00%	(15.00%)