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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 70,838	$ 68,816	$ 69,241	$ 64,680	$ 82,073	$ 74,575	$ 74,329	$ 66,838	$ 273,575	$ 297,815	$ 536,034
Direct operating expenses									119,412	125,242	119,283
Selling, general and administrative expenses									53,965	51,535	49,116
Depreciation and amortization									16,648	16,273	16,411
Operating income (loss)									(1,653)	33,577	277,861
Corporate expenses									28,067	26,865	27,937
Change in fair value of contingent consideration									(6,478)	(1,202)
Impairment charge									32,097
Foreign currency (gain) loss									754	1,616	350
Other operating (gain) loss									(5,994)	(1,187)	(262)
Capital expenditures									25,284	15,717	12,688
Total assets	656,200				690,409				$ 656,200	$ 690,409	766,139
Percentage change in net revenue									(8.00%)	(44.00%)
Percentage change in direct operating expenses									(5.00%)	5.00%
Percentage change in selling, general and administrative expenses									5.00%	5.00%
Percentage change in depreciation and amortization									2.00%	(1.00%)
Percentage change in segment operating profit (loss)									(22.00%)	(80.00%)
Percentage change in corporate expenses									4.00%	(4.00%)
Percentage change in fair value of contingent consideration									439.00%
Percentage change in foreign currency (gain) loss									(53.00%)	362.00%
Percentage change in other operating (gain) loss									405.00%	353.00%
Percentage change in operating income (loss)										(88.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ 46,793	$ 59,669	305,886
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses									28,067	26,865	27,937
Television
Segment Reporting Information [Line Items]
Direct operating expenses									61,778	62,434	59,454
Selling, general and administrative expenses									22,638	21,864	22,276
Depreciation and amortization									10,059	9,024	9,760
Capital expenditures									24,174	14,336	10,945
Total assets	465,758				487,929				$ 465,758	$ 487,929	556,942
Percentage change in direct operating expenses									(1.00%)	5.00%
Percentage change in selling, general and administrative expenses									4.00%	(2.00%)
Percentage change in depreciation and amortization									11.00%	(8.00%)
Percentage change in segment operating profit (loss)									(7.00%)	(81.00%)
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ 55,179	$ 59,589	308,172
Radio
Segment Reporting Information [Line Items]
Direct operating expenses									39,277	41,287	44,572
Selling, general and administrative expenses									17,423	18,081	18,743
Depreciation and amortization									1,866	2,490	2,673
Capital expenditures									792	350	1,679
Total assets	138,463				121,020				$ 138,463	$ 121,020	126,248
Percentage change in direct operating expenses									(5.00%)	(7.00%)
Percentage change in selling, general and administrative expenses									(4.00%)	(4.00%)
Percentage change in depreciation and amortization									(25.00%)	(7.00%)
Percentage change in segment operating profit (loss)										118.00%
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ (3,553)	$ 2,064	946
Digital
Segment Reporting Information [Line Items]
Cost of revenue									36,757	45,096	32,998
Direct operating expenses									18,357	21,521	15,257
Selling, general and administrative expenses									13,904	11,590	8,097
Depreciation and amortization									4,723	4,759	3,978
Capital expenditures									318	1,031	64
Total assets	$ 51,979				$ 81,460				$ 51,979	$ 81,460	82,949
Percentage change in cost of revenue									(18.00%)	37.00%
Percentage change in direct operating expenses									(15.00%)	41.00%
Percentage change in selling, general and administrative expenses									20.00%	43.00%
Percentage change in depreciation and amortization									(1.00%)	20.00%
Percentage change in segment operating profit (loss)									144.00%	(39.00%)
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ (4,833)	$ (1,984)	(3,232)
Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue									$ 260,514	$ 294,839	272,091
Percentage change in net revenue									(12.00%)	8.00%
Advertising and Retransmission Consent \| Television
Segment Reporting Information [Line Items]
Net revenue									$ 136,593	$ 149,935	148,059
Percentage change in net revenue									(9.00%)	1.00%
Advertising and Retransmission Consent \| Radio
Segment Reporting Information [Line Items]
Net revenue									$ 55,013	$ 63,922	66,934
Percentage change in net revenue									(14.00%)	(4.00%)
Advertising and Retransmission Consent \| Digital
Segment Reporting Information [Line Items]
Net revenue									$ 68,908	$ 80,982	57,098
Percentage change in net revenue									(15.00%)	42.00%
Spectrum Usage Rights
Segment Reporting Information [Line Items]
Net revenue									$ 13,061	$ 2,976	263,943
Percentage change in net revenue									339.00%	(99.00%)
Spectrum Usage Rights \| Television
Segment Reporting Information [Line Items]
Cost of revenue											$ 12,340
Percentage change in cost of revenue										(100.00%)