Derivative Financial Instruments - Additional Information (Detail) (USD $)			3 Months Ended			3 Months Ended			1 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Green Bay Option	Mar. 31, 2012 Green Bay Option	Dec. 31, 2012 Green Bay Option	Mar. 31, 2013 Green Bay Option Clear Channel and the Company	Apr. 10, 2009 Green Bay Option Clear Channel and the Company Segment	Dec. 08, 2011 Interest Rate Cap	Dec. 08, 2011 Interest Rate Cap J P Morgan	Mar. 31, 2013 Interest Rate Cap J P Morgan	Mar. 31, 2012 Interest Rate Cap J P Morgan	Dec. 31, 2012 Interest Rate Cap J P Morgan
Derivatives, Fair Value [Line Items]
Interest rate cap aggregate notional amount								$ 71,300,000	$ 71,300,000
LIBOR-based variable interest rate component of long-term debt									3.00%
Long-term assets attributable to the fair value of the interest rate cap										1,000,000		1,000,000
Interest expense										0	100,000
Swap agreement, Date of maturity									Dec. 08, 2015
Monthly fee for operation							200,000
Number of Green Bay radio stations to be purchased due to Clear channel's Put option							5
Term of payment							5 years
Put option amount							17,600,000
LMA expiration date						Dec. 31, 2013
Date of inception of purchase						Jul. 01, 2013
Duration of swap agreement						2 months
Other current liabilities	10,648,000	11,386,000	10,600,000		11,400,000
Realized gain on derivative instruments associated with marking to market the Green Bay Option			$ 700,000	$ 100,000