Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net revenue	$ 64,680	$ 66,838
Direct operating expenses	28,930	31,033
Selling, general and administrative expenses	13,814	13,294
Depreciation and amortization	3,916	3,939
Operating income (loss)	4,989	(319)
Corporate expenses	6,894	5,975
Change in fair value contingent consideration	359	2,100
Foreign currency (gain) loss	132	213
Other operating (gain) loss	(1,996)	(22)
Interest expense	(3,490)	(3,398)
Interest income	919	913
Dividend income	255	128
Income (loss) before income taxes	2,673	(2,676)
Capital expenditures	6,842	2,227
Total assets	$ 720,188	690,409	$ 690,409
Percentage change in net revenue	(3.00%)
Percentage change in direct operating expenses	(7.00%)
Percentage change in selling, general and administrative expenses	4.00%
Percentage change in depreciation and amortization	(1.00%)
Percentage change in segment operating profit (loss)	31.00%
Percentage change in corporate expenses	15.00%
Change in fair value contingent consideration	(83.00%)
Percentage change in foreign currency (gain) loss	(38.00%)
Percentage change in interest expense	3.00%
Percentage change in interest income	1.00%
Percentage change in dividend income	99.00%
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 10,378	7,947
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	6,894	5,975
Television
Segment Reporting Information [Line Items]
Net revenue	38,253	34,491
Direct operating expenses	14,927	15,550
Selling, general and administrative expenses	5,814	5,972
Depreciation and amortization	2,260	2,204
Capital expenditures	6,341	2,080
Total assets	$ 507,024	487,929
Percentage change in net revenue	11.00%
Percentage change in direct operating expenses	(4.00%)
Percentage change in selling, general and administrative expenses	(3.00%)
Percentage change in depreciation and amortization	3.00%
Percentage change in segment operating profit (loss)	42.00%
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 15,252	10,765
Radio
Segment Reporting Information [Line Items]
Net revenue	11,955	14,103
Direct operating expenses	9,508	10,674
Selling, general and administrative expenses	4,775	4,606
Depreciation and amortization	332	619
Capital expenditures	382	81
Total assets	$ 137,488	121,020
Percentage change in net revenue	(15.00%)
Percentage change in direct operating expenses	(11.00%)
Percentage change in selling, general and administrative expenses	4.00%
Percentage change in depreciation and amortization	(46.00%)
Percentage change in segment operating profit (loss)	48.00%
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (2,660)	(1,796)
Digital
Segment Reporting Information [Line Items]
Net revenue	14,472	18,244
Cost of revenue	7,642	10,625
Direct operating expenses	4,495	4,809
Selling, general and administrative expenses	3,225	2,716
Depreciation and amortization	1,324	1,116
Capital expenditures	119	66
Total assets	$ 75,676	81,460
Percentage change in net revenue	(21.00%)
Percentage change in cost of revenue	(28.00%)
Percentage change in direct operating expenses	(7.00%)
Percentage change in selling, general and administrative expenses	19.00%
Percentage change in depreciation and amortization	19.00%
Percentage change in segment operating profit (loss)	117.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (2,214)	$ (1,022)

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