Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenue	$ 57,510	$ 58,113
Cost of revenue - digital media	1,752	1,839
Direct operating expenses	27,092	27,565
Selling, general and administrative expenses	11,200	11,435
Depreciation and amortization	3,546	4,027
Operating income (loss)	8,053	7,643
Corporate expenses	5,867	5,604
Interest expense	(3,645)	(3,866)
Interest income	109	7
Income before income taxes	4,517	3,784
Capital expenditures	1,244	2,239
Total assets	$ 514,265		$ 517,921
Percentage change in net revenue	(1.00%)
Percentage change in direct operating expenses	(2.00%)
Percentage change in selling, general and administrative expenses	(2.00%)
Percentage change in depreciation and amortization	(12.00%)
Percentage change in segment operating profit (loss)	5.00%
Percentage change in corporate expenses	5.00%
Percentage change in operating income (loss)	5.00%
Percentage change in interest expenses	(6.00%)
Percentage change in interest income	1457.00%
Percentage change in income (loss) before income taxes	19.00%
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 13,920	13,247
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	5,867	5,604
Television
Segment Reporting Information [Line Items]
Net revenue	37,710	36,565
Direct operating expenses	14,754	15,034
Selling, general and administrative expenses	5,451	5,446
Depreciation and amortization	2,463	2,867
Capital expenditures	967	1,419
Total assets	$ 363,738		363,852
Percentage change in net revenue	3.00%
Percentage change in direct operating expenses	(2.00%)
Percentage change in selling, general and administrative expenses	0.00%
Percentage change in depreciation and amortization	(14.00%)
Percentage change in segment operating profit (loss)	14.00%
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 15,042	13,218
Radio
Segment Reporting Information [Line Items]
Net revenue	15,719	16,884
Direct operating expenses	11,017	10,941
Selling, general and administrative expenses	4,704	4,888
Depreciation and amortization	726	790
Capital expenditures	268	771
Total assets	$ 128,928		129,825
Percentage change in net revenue	(7.00%)
Percentage change in direct operating expenses	1.00%
Percentage change in selling, general and administrative expenses	(4.00%)
Percentage change in depreciation and amortization	(8.00%)
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (728)	265
Digital
Segment Reporting Information [Line Items]
Net revenue	4,081	4,664
Cost of revenue - digital media	1,752	1,839
Direct operating expenses	1,321	1,590
Selling, general and administrative expenses	1,045	1,101
Depreciation and amortization	357	370
Capital expenditures	9	49
Total assets	$ 21,599		$ 24,244
Percentage change in net revenue	(13.00%)
Percentage change in cost of revenue	(5.00%)
Percentage change in direct operating expenses	(17.00%)
Percentage change in selling, general and administrative expenses	(5.00%)
Percentage change in depreciation and amortization	(4.00%)
Percentage change in segment operating profit (loss)	67.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (394)	$ (236)

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