Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net revenue	$ 148,880	$ 64,249
Direct operating expenses	26,561	26,679
Selling, general and administrative expenses	13,853	13,591
Depreciation and amortization	5,184	4,512
Operating income (loss)	11,369	(35,227)
Corporate expenses	7,158	6,840
Impairment charge	1,326	39,835
Foreign currency (gain) loss	586	1,508
Other operating (gain) loss	(1,913)	(836)
Interest expense	(1,717)	(2,680)
Interest income	140	624
Dividend income	2	23
Income (loss) before income taxes	9,794	(37,260)
Capital expenditures	1,513	3,676
Total assets	$ 752,168	747,345	$ 747,345
Percentage change in net revenue	132.00%
Percentage change in direct operating expenses	0.00%
Percentage change in selling, general and administrative expenses	2.00%
Percentage change in depreciation and amortization	15.00%
Percentage change in segment operating profit (loss)	53.00%
Percentage change in corporate expenses	5.00%
Percentage change in impairment charge	(97.00%)
Percentage change in foreign currency (gain) loss	(61.00%)
Percentage change in other operating (gain) loss	129.00%
Percentage change in interest expense	(36.00%)
Percentage change in interest income	(78.00%)
Percentage change in dividend income	(91.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 18,526	12,120
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	7,158	6,840
Television
Segment Reporting Information [Line Items]
Direct operating expenses	14,969	15,825
Selling, general and administrative expenses	4,915	5,932
Depreciation and amortization	3,216	2,875
Capital expenditures	1,031	3,182
Total assets	$ 434,758	425,899
Percentage change in direct operating expenses	(5.00%)
Percentage change in selling, general and administrative expenses	(17.00%)
Percentage change in depreciation and amortization	12.00%
Percentage change in segment operating profit (loss)	(11.00%)
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 12,991	14,567
Television \| Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue	$ 36,091	39,199
Percentage change in net revenue	(8.00%)
Radio
Segment Reporting Information [Line Items]
Direct operating expenses	$ 6,691	7,661
Selling, general and administrative expenses	2,989	3,988
Depreciation and amortization	387	487
Capital expenditures	146	196
Total assets	$ 120,859	125,426
Percentage change in direct operating expenses	(13.00%)
Percentage change in selling, general and administrative expenses	(25.00%)
Percentage change in depreciation and amortization	(21.00%)
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 1,240	(417)
Radio \| Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue	$ 11,307	11,719
Percentage change in net revenue	(4.00%)
Digital
Segment Reporting Information [Line Items]
Cost of revenue	$ 84,756	7,347
Direct operating expenses	4,901	3,193
Selling, general and administrative expenses	5,949	3,671
Depreciation and amortization	1,581	1,150
Capital expenditures	336	298
Total assets	$ 196,551	196,020
Percentage change in direct operating expenses	53.00%
Percentage change in selling, general and administrative expenses	62.00%
Percentage change in depreciation and amortization	37.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 4,295	(2,030)
Digital \| Advertising and Retransmission Consent
Segment Reporting Information [Line Items]
Net revenue	$ 101,482	$ 13,331
Percentage change in net revenue	661.00%

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