Acquisitions and Dispositions - Additional Information (Detail) (USD $)	6 Months Ended		0 Months Ended		6 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended	0 Months Ended			0 Months Ended
	Jun. 30, 2014 Affiliate Market	Jun. 30, 2013	Dec. 31, 2013 Green Bay Purchase Station	Apr. 10, 2009 Green Bay Purchase Station	Jun. 30, 2014 Green Bay Purchase	Dec. 31, 2013 Green Bay Purchase Station	Dec. 12, 2013 WestwoodOne Acquisition Station	Jun. 30, 2014 WestwoodOne Acquisition	Jun. 30, 2014 WestwoodOne Acquisition	Nov. 14, 2013 Townsquare Transaction Station Market	Jun. 30, 2014 Townsquare Transaction	Jan. 08, 2013 WFME Asset Exchange	Jun. 30, 2014 WFME Asset Exchange Maximum	Dec. 31, 2013 WFME Asset Exchange Maximum	Jan. 17, 2013 Pamal Broadcasting Asset Purchase
Business Acquisition [Line Items]
Number of radio stations acquired			5	5		5				5
Total purchase price			$ 17,600,000									$ 40,083,000			$ 6,483,000
Revenue growth rates (percentage)			2.50%				2.00%			2.00%
Discount rate used in fair value calculations (percentage)			10.00%				10.00%			10.00%
Purchase accounting adjustment to reflect final determination of fair value					2,600,000						3,600,000
Number of radio stations	10,000						10,000
Acquisition purchase price paid in cash							45,000,000					40,000,000
Repayments of outstanding debt	66,125,000	38,931,000					215,000,000
Add: Cash received							235,000,000			235,000,000
Amount of purchase price placed in escrow							22,500,000
Revenues attributable to acquiree included in condensed consolidated statement of operations								62,700,000	134,000,000
Number of radio stations sold										53
Number of markets	90									12
Number of radio stations exchanged										15
Number of markets for radio stations exchanged										2
Total purchase price if certain future conditions are met												10,000,000
Estimated fair value of contingent consideration												$ 31,000	$ 100,000	$ 100,000
Future market revenue growth rates for residual year												2.00%
Weighted average cost of capital												10.00%