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Corporate expenses.

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Percentage change in expenses.

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Percentage change in net revenue.

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Percentage change in other operating (gain) loss.

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Percentage change in selling, general and administrative expenses.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net revenue	$ 82,073	$ 74,575	$ 74,329	$ 66,838	$ 73,460	$ 334,555	$ 70,509	$ 57,510	$ 297,815	$ 536,034	$ 258,514
Direct operating expenses									125,242	119,283	113,439
Selling, general and administrative expenses									51,535	49,116	46,798
Depreciation and amortization									16,273	16,411	15,342
Operating income (loss)									33,577	277,861	48,856
Corporate expenses									26,865	27,937	24,543
Change in fair value contingent consideration									(1,202)
Foreign currency (gain) loss									1,616	350
Other operating (gain) loss									(1,187)	(262)
Capital expenditures									15,717	12,688	9,308
Total assets	690,409				766,139				$ 690,409	$ 766,139	517,921
Percentage change in net revenue									(44.00%)	107.00%
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									(1.00%)	7.00%
Percentage change in segment operating profit (loss)									(80.00%)	317.00%
Percentage change in corporate expenses									(4.00%)	14.00%
Percentage change in foreign currency (gain) loss									362.00%
Percentage change in other operating (gain) loss									353.00%
Percentage change in operating income (loss)									(88.00%)	469.00%
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ 59,669	$ 305,886	73,399
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses									26,865	27,937	24,543
Television
Segment Reporting Information [Line Items]
Direct operating expenses									62,434	59,454	62,020
Selling, general and administrative expenses									21,864	22,276	21,591
Depreciation and amortization									9,024	9,760	10,659
Capital expenditures									14,336	10,945	5,744
Total assets	487,929				556,942				$ 487,929	$ 556,942	363,852
Percentage change in direct operating expenses									5.00%	(4.00%)
Percentage change in selling, general and administrative expenses									(2.00%)	3.00%
Percentage change in depreciation and amortization									(8.00%)	(8.00%)
Percentage change in segment operating profit (loss)									(81.00%)	372.00%
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ 59,589	$ 308,172	65,253
Radio
Segment Reporting Information [Line Items]
Direct operating expenses									41,287	44,572	44,949
Selling, general and administrative expenses									18,081	18,743	20,441
Depreciation and amortization									2,490	2,673	3,269
Capital expenditures									350	1,679	3,287
Total assets	121,020				126,248				$ 121,020	$ 126,248	129,825
Percentage change in direct operating expenses									(7.00%)	(1.00%)
Percentage change in selling, general and administrative expenses									(4.00%)	(8.00%)
Percentage change in depreciation and amortization									(7.00%)	(18.00%)
Percentage change in segment operating profit (loss)									118.00%	(87.00%)
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ 2,064	$ 946	7,188
Digital
Segment Reporting Information [Line Items]
Cost of revenue									45,096	32,998	9,536
Direct operating expenses									21,521	15,257	6,470
Selling, general and administrative expenses									11,590	8,097	4,766
Depreciation and amortization									4,759	3,978	1,414
Capital expenditures									1,031	64	277
Total assets	$ 81,460				$ 82,949				$ 81,460	$ 82,949	24,244
Percentage change in cost of revenue									37.00%	246.00%
Percentage change in direct operating expenses									41.00%	136.00%
Percentage change in selling, general and administrative expenses									43.00%	70.00%
Percentage change in depreciation and amortization									20.00%	181.00%
Percentage change in segment operating profit (loss)									(39.00%)
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									$ (1,984)	$ (3,232)	958
Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Total net revenue									$ 294,839	$ 272,091	258,514
Percentage change in net revenue									8.00%	5.00%
Advertising and Retransmission Consent \| Television
Segment Reporting Information [Line Items]
Total net revenue									$ 149,935	$ 148,059	159,523
Percentage change in net revenue									1.00%	(7.00%)
Advertising and Retransmission Consent \| Radio
Segment Reporting Information [Line Items]
Total net revenue									$ 63,922	$ 66,934	75,847
Percentage change in net revenue									(4.00%)	(12.00%)
Advertising and Retransmission Consent \| Digital
Segment Reporting Information [Line Items]
Total net revenue									$ 80,982	$ 57,098	$ 23,144
Percentage change in net revenue									42.00%	147.00%
Spectrum Usage Rights
Segment Reporting Information [Line Items]
Total net revenue									$ 2,976	$ 263,943
Percentage change in net revenue									(99.00%)
Spectrum Usage Rights \| Television
Segment Reporting Information [Line Items]
Cost of revenue										$ 12,340