Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net Revenue	$ 66,838	$ 57,510
Direct operating expenses	31,033	27,092
Selling, general and administrative expenses	13,294	11,200
Depreciation and amortization	3,939	3,546
Operating income (loss)	(341)	8,053
Corporate expenses	5,975	5,867
Change in fair value of contingent consideration	2,100
Foreign currency (gain) loss	213
Interest expense	(3,398)	(3,645)
Interest income	913	109
Dividend income	128
Other income (loss)	22
Income (loss) before income taxes	(2,676)	4,517
Capital expenditures	2,227	1,244
Total assets	$ 745,902	765,967	$ 765,967
Percentage change in net revenue	16.00%
Percentage change in direct operating expenses	15.00%
Percentage change in selling, general and administrative expenses	19.00%
Percentage change in depreciation and amortization	11.00%
Percentage change in segment operating profit (loss)	(43.00%)
Percentage change in corporate expenses	2.00%
Percentage change in interest expense	(7.00%)
Percentage change in interest income	738.00%
Percentage change in income (loss) before income taxes	(159.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 7,947	13,920
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	5,975	5,867
Television
Segment Reporting Information [Line Items]
Net Revenue	34,491	37,710
Direct operating expenses	15,550	14,754
Selling, general and administrative expenses	5,972	5,451
Depreciation and amortization	2,204	2,463
Capital expenditures	2,080	967
Total assets	$ 543,974	556,942
Percentage change in net revenue	(9.00%)
Percentage change in direct operating expenses	5.00%
Percentage change in selling, general and administrative expenses	10.00%
Percentage change in depreciation and amortization	(11.00%)
Percentage change in segment operating profit (loss)	(28.00%)
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 10,765	15,042
Radio
Segment Reporting Information [Line Items]
Net Revenue	14,103	15,719
Direct operating expenses	10,674	11,017
Selling, general and administrative expenses	4,606	4,704
Depreciation and amortization	619	726
Capital expenditures	81	268
Total assets	$ 122,636	126,248
Percentage change in net revenue	(10.00%)
Percentage change in direct operating expenses	(3.00%)
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)	147.00%
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (1,796)	(728)
Digital
Segment Reporting Information [Line Items]
Net Revenue	18,244	4,081
Cost of revenue	10,625	1,752
Direct operating expenses	4,809	1,321
Selling, general and administrative expenses	2,716	1,045
Depreciation and amortization	1,116	357
Capital expenditures	66	9
Total assets	$ 79,292	82,777
Percentage change in net revenue	347.00%
Percentage change in cost of revenue	506.00%
Percentage change in direct operating expenses	264.00%
Percentage change in selling, general and administrative expenses	160.00%
Percentage change in depreciation and amortization	213.00%
Percentage change in segment operating profit (loss)	159.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (1,022)	$ (394)

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