Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 65,281	$ 69,261	$ 188,223	$ 188,702
Cost of revenue - digital media	2,281	1,881	6,493	4,633
Direct operating expenses	28,238	27,624	84,341	81,353
Selling, general and administrative expenses	11,949	11,180	34,794	32,165
Depreciation and amortization	3,812	4,030	11,724	11,950
Operating income (loss)	13,273	19,011	34,246	43,023
Corporate expenses	5,728	5,535	16,625	15,578
Interest expense	(3,894)	(3,286)	(11,619)	(9,769)
Interest income	71	12	196	31
Income before income taxes	9,450	15,737	22,823	33,285
Capital expenditures	2,336	1,794	6,922	11,528
Total assets	$ 531,059		$ 531,059		$ 524,962
Percentage change in net revenue	(6.00%)		0.00%
Percentage change in direct operating expenses	2.00%		4.00%
Percentage change in selling, general and administrative expenses	7.00%		8.00%
Percentage change in depreciation and amortization	(5.00%)		(2.00%)
Percentage change in segment operating profit (loss)	(23.00%)		(13.00%)
Percentage change in corporate expenses	3.00%		7.00%
Percentage change in operating income (loss)	(30.00%)		(20.00%)
Percentage change in interest expenses	19.00%		19.00%
Percentage change in interest income	492.00%		532.00%
Percentage change in income (loss) before income taxes	(40.00%)		(31.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 19,001	24,546	$ 50,871	58,601
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	5,728	5,535	16,625	15,578
Television
Segment Reporting Information [Line Items]
Net revenue	40,363	43,393	116,143	119,292
Direct operating expenses	15,604	15,159	46,113	44,658
Selling, general and administrative expenses	5,547	5,286	16,186	15,270
Depreciation and amortization	2,614	2,964	8,186	8,589
Capital expenditures	1,641	294	4,199	6,653
Total assets	$ 377,532		$ 377,532		367,869
Percentage change in net revenue	(7.00%)		(3.00%)
Percentage change in direct operating expenses	3.00%		3.00%
Percentage change in selling, general and administrative expenses	5.00%		6.00%
Percentage change in depreciation and amortization	(12.00%)		(5.00%)
Percentage change in segment operating profit (loss)	(17.00%)		(10.00%)
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 16,598	19,984	$ 45,658	50,775
Radio
Segment Reporting Information [Line Items]
Net revenue	19,169	20,855	55,605	56,785
Direct operating expenses	11,284	11,027	33,510	31,865
Selling, general and administrative expenses	5,138	4,838	14,976	14,132
Depreciation and amortization	847	767	2,479	2,465
Capital expenditures	660	1,341	2,492	4,616
Total assets	$ 129,456		$ 129,456		132,395
Percentage change in net revenue	(8.00%)		(2.00%)
Percentage change in direct operating expenses	2.00%		5.00%
Percentage change in selling, general and administrative expenses	6.00%		6.00%
Percentage change in depreciation and amortization	10.00%		1.00%
Percentage change in segment operating profit (loss)	(55.00%)		(44.00%)
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 1,900	4,223	$ 4,640	8,323
Digital
Segment Reporting Information [Line Items]
Net revenue	5,749	5,013	16,475	12,625
Cost of revenue - digital media	2,281	1,881	6,493	4,633
Direct operating expenses	1,350	1,438	4,718	4,830
Selling, general and administrative expenses	1,264	1,056	3,632	2,763
Depreciation and amortization	351	299	1,059	896
Capital expenditures	35	159	231	259
Total assets	$ 24,071		$ 24,071		$ 24,698
Percentage change in net revenue	15.00%		30.00%
Percentage change in cost of revenue	21.00%		40.00%
Percentage change in direct operating expenses	(6.00%)		(2.00%)
Percentage change in selling, general and administrative expenses	20.00%		31.00%
Percentage change in depreciation and amortization	17.00%		18.00%
Percentage change in segment operating profit (loss)	48.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 503	$ 339	$ 573	$ (497)

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