Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenue	$ 69,261	$ 62,274	$ 188,702	$ 176,776
Cost of revenue - digital media	1,881	1,489	4,633	1,489
Direct operating expenses	27,624	26,307	81,353	76,732
Selling, general and administrative expenses	11,180	9,637	32,165	27,720
Depreciation and amortization	4,030	3,785	11,950	10,803
Operating income (loss)	19,011	16,157	43,023	45,036
Corporate expenses	5,535	4,899	15,578	14,996
Interest expense	(3,286)	(3,501)	(9,769)	(10,408)
Interest income	12	12	31	37
Income (loss) before income taxes	15,737	12,668	33,285	34,665
Capital expenditures	1,794	2,395	11,528	6,724
Total assets	$ 543,058		$ 543,058		$ 527,767
Percentage change in net revenue	11.00%		7.00%
Percentage change in direct operating expenses	5.00%		6.00%
Percentage change in selling, general and administrative expenses	16.00%		16.00%
Percentage change in depreciation and amortization	6.00%		11.00%
Percentage change in segment operating profit (loss)	17.00%		(2.00%)
Percentage change in Corporate expenses	13.00%		4.00%
Percentage change in operating income (loss)	18.00%		(4.00%)
Percentage change in interest expenses	(6.00%)		(6.00%)
Percentage change in interest income			(16.00%)
Percentage change in income (loss) before income taxes	24.00%		(4.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 24,546	21,056	$ 58,601	60,032
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	5,535	4,899	15,578	14,996
Television
Segment Reporting Information [Line Items]
Net revenue	43,393	41,301	119,292	122,193
Direct operating expenses	15,159	15,171	44,658	45,075
Selling, general and administrative expenses	5,286	4,952	15,270	14,685
Depreciation and amortization	2,964	2,621	8,589	8,007
Capital expenditures	294	1,351	6,653	3,925
Total assets	$ 386,959		$ 386,959		380,775
Percentage change in net revenue	5.00%		(2.00%)
Percentage change in direct operating expenses	0.00%		(1.00%)
Percentage change in selling, general and administrative expenses	7.00%		4.00%
Percentage change in depreciation and amortization	13.00%		7.00%
Percentage change in segment operating profit (loss)	8.00%		(7.00%)
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 19,984	18,557	$ 50,775	54,426
Radio
Segment Reporting Information [Line Items]
Net revenue	20,855	18,081	56,785	51,691
Direct operating expenses	11,027	10,131	31,865	30,652
Selling, general and administrative expenses	4,838	4,150	14,132	12,500
Depreciation and amortization	767	868	2,465	2,500
Capital expenditures	1,341	1,029	4,616	2,779
Total assets	$ 133,077		$ 133,077		124,050
Percentage change in net revenue	15.00%		10.00%
Percentage change in direct operating expenses	9.00%		4.00%
Percentage change in selling, general and administrative expenses	17.00%		13.00%
Percentage change in depreciation and amortization	(12.00%)		(1.00%)
Percentage change in segment operating profit (loss)	44.00%		38.00%
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 4,223	2,932	$ 8,323	6,039
Digital
Segment Reporting Information [Line Items]
Net revenue	5,013	2,892	12,625	2,892
Cost of revenue - digital media	1,881	1,489	4,633	1,489
Direct operating expenses	1,438	1,005	4,830	1,005
Selling, general and administrative expenses	1,056	535	2,763	535
Depreciation and amortization	299	296	896	296
Capital expenditures	159	15	259	20
Total assets	$ 23,022		$ 23,022		$ 22,942
Percentage change in net revenue	73.00%		337.00%
Percentage change in Cost of revenue	26.00%		211.00%
Percentage change in direct operating expenses	43.00%		381.00%
Percentage change in selling, general and administrative expenses	97.00%		416.00%
Percentage change in depreciation and amortization	1.00%		203.00%
Percentage change in segment operating profit (loss)			15.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 339	$ (433)	$ (497)	$ (433)

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