Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenue	$ 70,509	$ 64,829	$ 128,019	$ 122,942
Cost of revenue - digital media	8,762	2,373	10,514	4,212
Direct operating expenses	29,915	28,538	57,007	56,103
Selling, general and administrative expenses	12,030	11,410	23,230	22,845
Depreciation and amortization	4,577	3,885	8,123	7,912
Operating income (loss)	9,255	13,330	17,308	20,973
Corporate expenses	5,619	5,293	11,486	10,897
Foreign currency transaction (gain) loss	351		351
Interest expense	(3,683)	(3,859)	(7,328)	(7,725)
Interest income	110	118	219	125
Income before income taxes	5,682	9,589	10,199	13,373
Capital expenditures	5,564	2,346	6,808	4,586
Total assets	$ 553,044		$ 553,044		$ 517,921
Percentage change in net revenue	9.00%		4.00%
Percentage change in direct operating expenses	5.00%		2.00%
Percentage change in selling, general and administrative expenses	5.00%		2.00%
Percentage change in depreciation and amortization	18.00%		3.00%
Percentage change in segment operating profit (loss)	(18.00%)		(9.00%)
Percentage change in corporate expenses	6.00%		5.00%
Percentage change in operating income (loss)	(31.00%)		(17.00%)
Percentage change in interest expenses	(5.00%)		(5.00%)
Percentage change in interest income	(7.00%)		75.00%
Percentage change in income (loss) before income taxes	(41.00%)		(24.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 15,225	18,623	$ 29,145	31,870
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	5,619	5,293	11,486	10,897
Television
Segment Reporting Information [Line Items]
Net revenue	37,764	39,215	75,474	75,780
Direct operating expenses	14,873	15,475	29,627	30,509
Selling, general and administrative expenses	5,277	5,193	10,728	10,639
Depreciation and amortization	2,500	2,705	4,963	5,572
Capital expenditures	4,985	1,138	5,952	2,558
Total assets	$ 349,140		$ 349,140		363,852
Percentage change in net revenue	(4.00%)		0.00%
Percentage change in direct operating expenses	(4.00%)		(3.00%)
Percentage change in selling, general and administrative expenses	2.00%		1.00%
Percentage change in depreciation and amortization	(8.00%)		(11.00%)
Percentage change in segment operating profit (loss)	(5.00%)		4.00%
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 15,114	15,842	$ 30,156	29,060
Radio
Segment Reporting Information [Line Items]
Net revenue	17,163	19,552	32,882	36,436
Direct operating expenses	11,039	11,285	22,056	22,226
Selling, general and administrative expenses	4,581	4,950	9,285	9,838
Depreciation and amortization	662	842	1,388	1,632
Capital expenditures	575	1,061	843	1,832
Total assets	$ 126,177		$ 126,177		129,825
Percentage change in net revenue	(12.00%)		(10.00%)
Percentage change in direct operating expenses	(2.00%)		(1.00%)
Percentage change in selling, general and administrative expenses	(7.00%)		(6.00%)
Percentage change in depreciation and amortization	(21.00%)		(15.00%)
Percentage change in segment operating profit (loss)	(64.00%)		(94.00%)
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 881	2,475	$ 153	2,740
Digital
Segment Reporting Information [Line Items]
Net revenue	15,582	6,062	19,663	10,726
Cost of revenue - digital media	8,762	2,373	10,514	4,212
Direct operating expenses	4,003	1,778	5,324	3,368
Selling, general and administrative expenses	2,172	1,267	3,217	2,368
Depreciation and amortization	1,415	338	1,772	708
Capital expenditures	4	147	13	196
Total assets	$ 77,727		$ 77,727		$ 24,244
Percentage change in net revenue	157.00%		83.00%
Percentage change in cost of revenue	269.00%		150.00%
Percentage change in direct operating expenses	125.00%		58.00%
Percentage change in selling, general and administrative expenses	71.00%		36.00%
Percentage change in depreciation and amortization	319.00%		150.00%
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ (770)	$ 306	$ (1,164)	$ 70

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