Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenue	$ 59,891	$ 61,846	$ 119,441	$ 114,502
Cost of revenue - digital media	1,392		2,752
Direct operating expenses	27,044	26,104	53,729	50,425
Selling, general and administrative expenses	10,484	8,897	20,985	18,083
Depreciation and amortization	3,958	3,503	7,920	7,018
Operating income (loss)	11,963	18,081	24,012	28,879
Corporate expenses	5,050	5,261	10,043	10,097
Interest expense	(3,256)	(3,469)	(6,483)	(6,907)
Interest income	11	13	19	25
Income (loss) before income taxes	8,718	14,625	17,548	21,997
Capital expenditures	6,492	2,493	9,734	4,329
Total assets	$ 534,434		$ 534,434		$ 527,767
Percentage change in net revenue	(3.00%)		4.00%
Percentage change in direct operating expenses	4.00%		7.00%
Percentage change in selling, general and administrative expenses	18.00%		16.00%
Percentage change in depreciation and amortization	13.00%		13.00%
Percentage change in segment operating profit (loss)	(27.00%)		(13.00%)
Percentage change in Corporate expenses	(4.00%)		(1.00%)
Percentage change in operating income (loss)	(34.00%)		(17.00%)
Percentage change in interest expenses	(6.00%)		(6.00%)
Percentage change in interest income	(15.00%)		(24.00%)
Percentage change in income (loss) before income taxes	(40.00%)		(20.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 17,013	23,342	$ 34,055	38,976
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	5,050	5,261	10,043	10,097
Television
Segment Reporting Information [Line Items]
Net revenue	36,397	43,151	75,899	80,892
Direct operating expenses	14,820	15,503	29,499	29,904
Selling, general and administrative expenses	4,929	4,683	9,984	9,733
Depreciation and amortization	2,830	2,671	5,625	5,386
Capital expenditures	4,288	1,662	6,359	2,574
Total assets	$ 382,616		$ 382,616		380,775
Percentage change in net revenue	(16.00%)		(6.00%)
Percentage change in direct operating expenses	(4.00%)		(1.00%)
Percentage change in selling, general and administrative expenses	5.00%		3.00%
Percentage change in depreciation and amortization	6.00%		4.00%
Percentage change in segment operating profit (loss)	(32.00%)		(14.00%)
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 13,818	20,294	$ 30,791	35,869
Radio
Segment Reporting Information [Line Items]
Net revenue	19,585	18,695	35,930	33,610
Direct operating expenses	10,652	10,601	20,838	20,521
Selling, general and administrative expenses	4,768	4,214	9,294	8,350
Depreciation and amortization	829	832	1,698	1,632
Capital expenditures	2,122	831	3,275	1,755
Total assets	$ 129,867		$ 129,867		124,050
Percentage change in net revenue	5.00%		7.00%
Percentage change in direct operating expenses	0.00%		2.00%
Percentage change in selling, general and administrative expenses	13.00%		11.00%
Percentage change in depreciation and amortization	0.00%		4.00%
Percentage change in segment operating profit (loss)	9.00%		32.00%
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 3,336	$ 3,048	$ 4,100	$ 3,107
Digital
Segment Reporting Information [Line Items]
Net revenue	3,909		7,612
Cost of revenue - digital media	1,392		2,752
Direct operating expenses	1,572		3,392
Selling, general and administrative expenses	787		1,707
Depreciation and amortization	299		597
Capital expenditures	82		100
Total assets	$ 21,951		$ 21,951		$ 22,942
Percentage change in net revenue	100.00%		100.00%
Percentage change in Cost of revenue	100.00%		100.00%
Percentage change in direct operating expenses	100.00%		100.00%
Percentage change in selling, general and administrative expenses	100.00%		100.00%
Percentage change in depreciation and amortization	100.00%		100.00%
Percentage change in segment operating profit (loss)	100.00%		100.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (141)		$ (836)

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