Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 64,829	$ 59,891	$ 122,942	$ 119,441
Cost of revenue - digital media	2,373	1,392	4,212	2,752
Direct operating expenses	28,538	27,044	56,103	53,729
Selling, general and administrative expenses	11,410	10,484	22,845	20,985
Depreciation and amortization	3,885	3,958	7,912	7,920
Operating income (loss)	13,330	11,963	20,973	24,012
Corporate expenses	5,293	5,050	10,897	10,043
Interest expense	(3,859)	(3,256)	(7,725)	(6,483)
Interest income	118	11	125	19
Income before income taxes	9,589	8,718	13,373	17,548
Capital expenditures	2,346	6,492	4,586	9,734
Total assets	$ 525,265		$ 525,265		$ 524,962
Percentage change in net revenue	8.00%		3.00%
Percentage change in direct operating expenses	6.00%		4.00%
Percentage change in selling, general and administrative expenses	9.00%		9.00%
Percentage change in depreciation and amortization	(2.00%)		0.00%
Percentage change in segment operating profit (loss)	9.00%		(6.00%)
Percentage change in corporate expenses	5.00%		9.00%
Percentage change in operating income (loss)	11.00%		(13.00%)
Percentage change in interest expenses	19.00%		19.00%
Percentage change in interest income	973.00%		558.00%
Percentage change in income (loss) before income taxes	10.00%		(24.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 18,623	17,013	$ 31,870	34,055
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	5,293	5,050	10,897	10,043
Television
Segment Reporting Information [Line Items]
Net revenue	39,215	36,397	75,780	75,899
Direct operating expenses	15,475	14,820	30,509	29,499
Selling, general and administrative expenses	5,193	4,929	10,639	9,984
Depreciation and amortization	2,705	2,830	5,572	5,625
Capital expenditures	1,138	4,288	2,558	6,359
Total assets	$ 372,055		$ 372,055		367,869
Percentage change in net revenue	8.00%		0.00%
Percentage change in direct operating expenses	4.00%		3.00%
Percentage change in selling, general and administrative expenses	5.00%		7.00%
Percentage change in depreciation and amortization	(4.00%)		(1.00%)
Percentage change in segment operating profit (loss)	15.00%		(6.00%)
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 15,842	13,818	$ 29,060	30,791
Radio
Segment Reporting Information [Line Items]
Net revenue	19,552	19,585	36,436	35,930
Direct operating expenses	11,285	10,652	22,226	20,838
Selling, general and administrative expenses	4,950	4,768	9,838	9,294
Depreciation and amortization	842	829	1,632	1,698
Capital expenditures	1,061	2,122	1,832	3,275
Total assets	$ 129,892		$ 129,892		132,395
Percentage change in net revenue	0.00%		1.00%
Percentage change in direct operating expenses	6.00%		7.00%
Percentage change in selling, general and administrative expenses	4.00%		6.00%
Percentage change in depreciation and amortization	2.00%		(4.00%)
Percentage change in segment operating profit (loss)	(26.00%)		(33.00%)
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 2,475	3,336	$ 2,740	4,100
Digital
Segment Reporting Information [Line Items]
Net revenue	6,062	3,909	10,726	7,612
Cost of revenue - digital media	2,373	1,392	4,212	2,752
Direct operating expenses	1,778	1,572	3,368	3,392
Selling, general and administrative expenses	1,267	787	2,368	1,707
Depreciation and amortization	338	299	708	597
Capital expenditures	147	82	196	100
Total assets	$ 23,318		$ 23,318		$ 24,698
Percentage change in net revenue	55.00%		41.00%
Percentage change in cost of revenue	70.00%		53.00%
Percentage change in direct operating expenses	13.00%		(1.00%)
Percentage change in selling, general and administrative expenses	61.00%		39.00%
Percentage change in depreciation and amortization	13.00%		19.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 306	$ (141)	$ 70	$ (836)

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