Segment Information - Separate Financial Data for Each of Company's Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 74,329	$ 70,509	$ 141,167	$ 128,019
Direct operating expenses	31,117	29,915	62,150	57,007
Selling, general and administrative expenses	12,673	12,030	25,967	23,230
Depreciation and amortization	4,019	4,577	7,958	8,123
Operating income (loss)	9,800	9,255	9,459	17,308
Corporate expenses	6,266	5,619	12,241	11,486
Change in fair value of contingent consideration	(913)		1,187
Foreign currency (gain) loss	(17)	351	196	351
Interest expense	(4,001)	(3,683)	(7,399)	(7,328)
Interest income	1,039	110	1,952	219
Dividend income	417		545
Other income (loss)	273		295
Income (loss) before income taxes	7,528	5,682	4,852	10,199
Capital expenditures	2,204	5,564	4,432	6,808
Total assets	$ 748,547		$ 748,547		$ 765,967
Percentage change in net revenue	5.00%		10.00%
Percentage change in direct operating expenses	4.00%		9.00%
Percentage change in selling, general and administrative expenses	5.00%		12.00%
Percentage change in depreciation and amortization	(12.00%)		(2.00%)
Percentage change in segment operating profit (loss)	(1.00%)		(21.00%)
Percentage change in corporate expenses	12.00%		7.00%
Percentage change in foreign currency (gain) loss			(44.00%)
Percentage change in operating income (loss)	6.00%		(45.00%)
Percentage change in interest expense	9.00%		1.00%
Percentage change in interest income	845.00%		791.00%
Percentage change in income (loss) before income taxes	32.00%		(52.00%)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 15,136	15,225	$ 23,083	29,145
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Corporate expenses	6,266	5,619	12,241	11,486
Television
Segment Reporting Information [Line Items]
Net revenue	36,531	37,764	71,022	75,474
Direct operating expenses	15,038	14,873	30,588	29,627
Selling, general and administrative expenses	5,551	5,277	11,523	10,728
Depreciation and amortization	2,277	2,500	4,481	4,963
Capital expenditures	1,942	4,985	4,023	5,952
Total assets	$ 535,660		$ 535,660		556,942
Percentage change in net revenue	(3.00%)		(6.00%)
Percentage change in direct operating expenses	1.00%		3.00%
Percentage change in selling, general and administrative expenses	5.00%		7.00%
Percentage change in depreciation and amortization	(9.00%)		(10.00%)
Percentage change in segment operating profit (loss)	(10.00%)		(19.00%)
Television \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 13,665	15,114	$ 24,430	30,156
Radio
Segment Reporting Information [Line Items]
Net revenue	17,240	17,163	31,343	32,882
Direct operating expenses	10,935	11,039	21,609	22,056
Selling, general and administrative expenses	4,502	4,581	9,108	9,285
Depreciation and amortization	621	662	1,240	1,388
Capital expenditures	81	575	162	843
Total assets	$ 123,901		$ 123,901		126,248
Percentage change in net revenue	0.00%		(5.00%)
Percentage change in direct operating expenses	(1.00%)		(2.00%)
Percentage change in selling, general and administrative expenses	(2.00%)		(2.00%)
Percentage change in depreciation and amortization	(6.00%)		(11.00%)
Percentage change in segment operating profit (loss)	34.00%		(501.00%)
Radio \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 1,182	881	$ (614)	153
Digital
Segment Reporting Information [Line Items]
Net revenue	20,558	15,582	38,802	19,663
Cost of revenue	11,384	8,762	22,009	10,514
Direct operating expenses	5,144	4,003	9,953	5,324
Selling, general and administrative expenses	2,620	2,172	5,336	3,217
Depreciation and amortization	1,121	1,415	2,237	1,772
Capital expenditures	181	4	247	13
Total assets	$ 88,986		$ 88,986		$ 82,777
Percentage change in net revenue	32.00%		97.00%
Percentage change in cost of revenue	30.00%		109.00%
Percentage change in direct operating expenses	29.00%		87.00%
Percentage change in selling, general and administrative expenses	21.00%		66.00%
Percentage change in depreciation and amortization	(21.00%)		26.00%
Percentage change in segment operating profit (loss)	(138.00%)		(37.00%)
Digital \| Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 289	$ (770)	$ (733)	$ (1,164)

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