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Segment Data - Separate Financial Data for Each of Company's Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Sales Information [Line Items]
Total assets	$ 538,237				$ 438,051				$ 538,237	$ 438,051	$ 467,321
Percentage change in Net Revenue									0.00%	15.00%
Percentage change in direct operating expenses									12.00%	4.00%
Percentage change in selling, general and administrative expenses									(17.00%)	4.00%
Percentage change in depreciation and amortization									(9.00%)	(12.00%)
Percentage change in segment operating profit									(4.00%)	52.00%
Percentage change in corporate expenses									10.00%	15.00%
Percentage change in operating income (loss)									(8.00%)	68.00%
Net revenue	60,093	57,786	56,950	49,087	63,752	58,486	54,491	46,524	223,916	223,253	194,396
Direct operating expenses									103,686	92,256	88,590
Selling, general and administrative expenses									31,556	37,818	36,511
Depreciation and amortization									14,953	16,426	18,653
Segment operating profit									73,721	76,753	50,642
Corporate expenses									19,771	17,976	15,669
Capital expenditures									9,748	9,900	8,218
Operating income (loss)									53,950	58,777	34,973
Television [Member]
Sales Information [Line Items]
Total assets	412,487				313,904				412,487	313,904	342,462
Percentage change in Net Revenue									0.00%	19.00%
Percentage change in direct operating expenses									12.00%	5.00%
Percentage change in selling, general and administrative expenses									(23.00%)	5.00%
Percentage change in depreciation and amortization									(9.00%)	(12.00%)
Percentage change in segment operating profit									(1.00%)	55.00%
Net revenue									156,994	156,839	131,490
Direct operating expenses									63,623	56,664	53,789
Selling, general and administrative expenses									15,797	20,571	19,606
Depreciation and amortization									12,084	13,312	15,189
Segment operating profit									65,490	66,292	42,906
Capital expenditures									7,243	8,339	6,494
Radio [Member]
Sales Information [Line Items]
Total assets	125,750				124,147				125,750	124,147	124,859
Percentage change in Net Revenue									1.00%	6.00%
Percentage change in direct operating expenses									13.00%	2.00%
Percentage change in selling, general and administrative expenses									(9.00%)	2.00%
Percentage change in depreciation and amortization									(8.00%)	(10.00%)
Percentage change in segment operating profit									(21.00%)	35.00%
Net revenue									66,922	66,414	62,906
Direct operating expenses									40,063	35,592	34,801
Selling, general and administrative expenses									15,759	17,247	16,905
Depreciation and amortization									2,869	3,114	3,464
Segment operating profit									8,231	10,461	7,736
Capital expenditures									$ 2,505	$ 1,561	$ 1,724